genesis-programs: Simplify get_programs(), specify a real Preview activation epoch for new BPFLoader (bp #11916)

[mergify]

This is an automated backport of pull request #11916 done by Mergify

Cherry-pick of f385af2 has failed:

On branch mergify/bp/v1.3/pr-11916
Your branch is up to date with 'origin/v1.3'.

You are currently cherry-picking commit f385af25e.
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Changes to be committed:

	modified:   runtime/src/bank.rs

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

	both modified:   genesis-programs/src/lib.rs

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[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #11930 into v1.3 will decrease coverage by 0.0%.
The diff coverage is 73.3%.

@@           Coverage Diff            @@
##            v1.3   #11930     +/-   ##
========================================
- Coverage   82.3%    82.3%   -0.1%     
========================================
  Files        332      332             
  Lines      78184    78179      -5     
========================================
- Hits       64377    64364     -13     
- Misses     13807    13815      +8