feat(DRAFT): Save the noir-repo content hash after each sync to a file

[aakoshh]

Updates noir/bootstrap.sh to:

• Save the content hash of noir-repo according to noir/.noir-repo.rebuild_patterns into noir/.noir-repo.hash every time there is a call to the noir_sync function. Do the same for the noir/.noir-repo.rebuild_patterns_tests, saving it into noir/.noir-repo.hash_tests
• Use the above two files, which are to be committed to aztec-packages, in tandem with noir/.rebuild_patterns, to return the hash in noir/bootstrap.sh hash and noir/bootstrap.sh hash-tests.

This way if we pass AZTEC_COMMIT_HASH then it will correctly roll back time and return a historical content hash. If the files change during sync, then the cache is disabled until their content is committed to aztec-packages.

This means that a PR to bump the version of noir must also update these, which we can add to the workflow that does it.

Example

% noir/bootstrap.sh hash                                                                                                                                                                            
c13aa0d774a1beba
% noir/bootstrap.sh hash-tests                                                                                                                                                                      
9db50268d214b4b5
% cd noir/noir-repo                                                                                                                                                                                 
% git status                                                                                                                                                                                    
HEAD detached from nightly-2025-03-18
nothing to commit, working tree clean
% echo "Hello" > hello.txt                                                                                                                                                                      
% git add hello.txt && git commit -m "Hello"                                                                                                                                                    
[detached HEAD 8d3b3a6f2a] Hello
 1 file changed, 1 insertion(+)
 create mode 100644 hello.txt
% cd ../..      

# This file was not actually part of the rebuild patterns
% noir/bootstrap.sh hash                                                                                                                                                                            
c13aa0d774a1beba
% cd noir/noir-repo                                                                                                                                                                                 
% echo "World" > compiler/world.txt                                                                                                                                                             
% git add compiler/world.txt && git commit -m "World"                                                                                                                                           
[detached HEAD 6ac59ad1c0] World
 1 file changed, 1 insertion(+)
 create mode 100644 compiler/world.txt
% cd ../..                                                                                                                                                                                      
% noir/bootstrap.sh hash                                                                                                                                                                            
disabled-cache
% git status                                                                                                                                                                                        
On branch af/noir-repo-hash-file
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
  (commit or discard the untracked or modified content in submodules)
	modified:   noir/.noir-repo.hash
	modified:   noir/.noir-repo.hash_tests

no changes added to commit (use "git add" and/or "git commit -a")
% git add noir                                                                                                                                                                                      
% git commit -m "Updated the hashes"          
[af/noir-repo-hash-file e9d9bcb391] Updated the hashes
 2 files changed, 2 insertions(+), 2 deletions(-)
% noir/bootstrap.sh hash                                                                                                                                                                            
e76134e49b62a0e1
% noir/bootstrap.sh hash-tests                                                                                                                                                                      
5bec282920ce6da5
% git log --oneline            

# historical query recovers the original hash
% AZTEC_CACHE_COMMIT=e0d40d95eb noir/bootstrap.sh hash                                                                                                                                              
c13aa0d774a1beba

[ludamad]

We can probably get rid of the test distinction imho

[ludamad]

For posterity: I don't like things relying on people committing files written out by bootstrap, we've gone through lengths to avoid that, hence asking for (for CI purposes) to just use the noir ref and patches