Fix greedy regex in BR removal, alignment detection, and subdirectory license matching

[Shrey-N]

This PR addresses edge case bugs discovered:

• Fix greedy regex in remove_setuptools_br:

  • Bug: The rich regex \({setuptools}\s+.+\) was too greedy. It could swallow subsequent parenthesis blocks, unintentionally deleting other dependencies on the same BuildRequires line.
  • Fix: Replaced .+ with [^)]+ to ensure the match stops at the very next closing parenthesis.

• Fix empty tag handling in alignment_of:

  • Bug: The tag_re regex required a non space character (\S) at the end of the line. alignment_of failed on tags with trailing spaces but no value (e.g., Name: \n), causing messy specfile formatting during substitutions like %py_provides.
  • Fix: Dropped the trailing \S requirement, allowing the alignment logic to capture spacing for empty tags.

• Improve %license detection for files in subdirectories (add_pyproject_files):

  • Bug: The fnmatch logic originally matched against the entire token path. If an RPM utilized something like %license XwhyZ-3.2.1/LICENSE, it would fail the glob match against LICEN[CS]E* and wouldn't append the -l flag to %pyproject_save_files.
  • Fix: Now matches the pattern against token.split("/")[-1] (the basename of the file), correctly identifying licenses inside standard subdirectories.

[hroncok]

I'm not sure about the lice se fix. That would only work if the macros are called from within a subdirectory. Can we detect that?

[Shrey-N]

Point we can detect that by scanning the %install section for pushd / cd commands occurring before the %pyproject_install call.
I will update the logic to only use the basename for licenses when we're inside that subdirectory context. Otherwise, we'll stay conservative and only move top level licenses to -l.

[Shrey-N]

I updated license detection to be context aware by scanning for pushd/cd in %install.

Also now includes fixes for:

• Issue %py3_install -- ... %{...} leads to %pyproject_install} #11 : Fixed superfluous brackets in macro conversion.
• Regex: Fixed greedy matching in BuildRequires removal.
• Safety: Improved egg info partitioning and empty tag alignment.