v2.3: Remove debug-signature feature from transaction-context (backport of #6647)

[mergify]

Problem

This feature cannot reliably be filtered from release builds, so the quick solution that was discussed is to remove it

Summary of Changes

Remove usages of solana_signature::Signature.

---

This is an automatic backport of pull request #6647 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of bd8ccc6 has failed:

On branch mergify/bp/v2.3/pr-6647
Your branch is up to date with 'origin/v2.3'.

You are currently cherry-picking commit bd8ccc6a2.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   programs/sbf/Cargo.lock
	modified:   svm/Cargo.toml
	modified:   svm/examples/Cargo.lock
	modified:   svm/src/transaction_processor.rs
	modified:   transaction-context/Cargo.toml
	modified:   transaction-context/src/lib.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   Cargo.toml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[t-nelson]

is this cargo fmt or cargo sort being "helpful"?

[mircea-c]

Yup, I ran cargo fmt

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.8%. Comparing base (2e7c31e) to head (518bb00).

Additional details and impacted files

@@            Coverage Diff            @@
##             v2.3    #6670     +/-   ##
=========================================
- Coverage    82.8%    82.8%   -0.1%     
=========================================
  Files         846      846             
  Lines      379283   379269     -14     
=========================================
- Hits       314423   314388     -35     
- Misses      64860    64881     +21     

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[steviez]

Wouldn't hurt to get a 👍 from @Lichtso, but removing the feature for simplicity seems reasonable to me

[mircea-c]

@steviez we have a review from SVM team on the original PR (#6647). I think that's good for our purposes.