fix compiler stub replacement

[minrk]

Description:

fixes regex to substitute only the compiler("x") part instead of the whole template string, so that it remains valid if there's other stuff going on like jinja filters.

So instead of turning

${{ compiler('x') }}

into

x_compiler_stub

it is turned into

${{ 'x_compiler_stub' }}

Checklist:

• Pydantic model updated or no update needed

Cross-refs, links to issues, etc:

this may fix #5382 (I can at least do a local call of:

text = read_recipe_yaml()

_render_recipe_yaml(text, platform_arch="linux-64", cbc_path="/path/to/openmpi-feedstock/.ci_support/linux_64_channel_targetsconda-forge_maincuda_compiler_version12.9mpi_typeconda.yam
      ⋮ l")

(note: it still fails if I don't give it a variant config due to the empty libfabric variable)

[beckermr]

See my comment on the issue. I think we should swallow all of the jinja.

[minrk]

got it. Now replaces the whole template string with the stub

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.77%. Comparing base (a3043f7) to head (2c836c5).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5609      +/-   ##
==========================================
+ Coverage   79.74%   79.77%   +0.02%     
==========================================
  Files         144      144              
  Lines       17006    17009       +3     
==========================================
+ Hits        13562    13569       +7     
+ Misses       3444     3440       -4     

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