Use bazel info workspace to get workspace, check for MODULE.bazel

[aran]

Fixes: #9444
Related: #9320, #9319
Merge before/after:

Description

1. Outsource bazel root detection to bazel info workspace
2. Allow multiple files to be declared as the Bazel root file, adding any found to deps. (1 chosen file now can be a set of several)
3. Update tests, which required separating the negative test from the positives.

Also tested on my actual repro to make sure it eliminated the very mysterious errors I was running into this morning :)

[codecov]

Codecov Report

Attention: Patch coverage is 73.07692% with 7 lines in your changes missing coverage. Please review.

Project coverage is 63.13%. Comparing base (290280e) to head (f7dad74).
Report is 1160 commits behind head on main.

Files	Patch %	Lines
pkg/skaffold/build/bazel/dependencies.go	73.07%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9445      +/-   ##
==========================================
- Coverage   70.48%   63.13%   -7.36%     
==========================================
  Files         515      645     +130     
  Lines       23150    33183   +10033     
==========================================
+ Hits        16317    20949    +4632     
- Misses       5776    10612    +4836     
- Partials     1057     1622     +565     

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