v3.0: program-runtime: drop metrics (backport of #7807)

[mergify]

Removes the single use of the solana-metrics dependency from program-runtime, ensuring all SVM crates no longer need solana-svm-metrics.

---

This is an automatic backport of pull request #7807 done by Mergify.

[mergify]

Cherry-pick of bef3d36 has failed:

On branch mergify/bp/v3.0/pr-7807
Your branch is up to date with 'origin/v3.0'.

You are currently cherry-picking commit bef3d3611.
  (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:   program-runtime/src/loaded_programs.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   program-runtime/Cargo.toml
	both modified:   program-runtime/src/lib.rs

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]

needs conflict resolution

[buffalojoec]

Requires #7824

[buffalojoec]

@t-nelson This should be g2g

[t-nelson]

you better find sme before ci finishes or that automerge is gonna fail 😂

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.5%. Comparing base (754b6de) to head (490c6d2).

Additional details and impacted files

@@           Coverage Diff           @@
##             v3.0    #7827   +/-   ##
=======================================
  Coverage    83.4%    83.5%           
=======================================
  Files         810      810           
  Lines      365318   365313    -5     
=======================================
+ Hits       304965   305045   +80     
+ Misses      60353    60268   -85     

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