Update dependencies for excluded modules

[XSAM]

Part of open-telemetry/opentelemetry-go-contrib#6440

Currently, the prerelease command won't update the version of dependencies for excluded modules. This brings an issue where prerelease cannot update dependencies for those example packages, which usually won't be released (thus excluded).

This PR fixes this issue by scanning all go modules under the root path regardless of whether they are excluded or not.

Blocked by #703

[codecov]

Codecov Report

Attention: Patch coverage is 61.53846% with 15 lines in your changes missing coverage. Please review.

Project coverage is 52.32%. Comparing base (af209eb) to head (50006d4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
multimod/internal/common/all_mod.go	61.53%	7 Missing and 3 partials ⚠️
multimod/internal/common/module_set_release.go	40.00%	2 Missing and 1 partial ⚠️
multimod/internal/common/versions.go	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #702      +/-   ##
==========================================
- Coverage   52.41%   52.32%   -0.10%     
==========================================
  Files          57       58       +1     
  Lines        3478     3490      +12     
==========================================
+ Hits         1823     1826       +3     
- Misses       1481     1487       +6     
- Partials      174      177       +3     

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[pellared]

@open-telemetry/collector-approvers, can you take a look and make sure it also won't cause any problems for the Collector releases?