osclib: freeze_command: handle 'product' repositories if used

[g7]

Some projects (such as SLFO) are using product-composer, and they build and publish in the 'product' repository.

If the 'product' repository is configured in the project meta, ensure it gets configured when freezing the staging.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 33.33333% with 12 lines in your changes missing coverage. Please review.

Project coverage is 28.03%. Comparing base (fe74cce) to head (5a5bfbb).

Files	Patch %	Lines
osclib/freeze_command.py	25.00%	12 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3103 +/- ## ========================================== + Coverage 28.00% 28.03% +0.03% ========================================== Files 86 86 Lines 14993 15009 +16 ========================================== + Hits 4199 4208 +9 - Misses 10794 10801 +7 ```

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[g7]

v3:

• rebased on current master
• since both images and product repositories are closely related, try to reuse the same code to handle both in prj_meta_for_bootstrap_copy

[gleidi-suse]

@Vogtinator I'd merge this if you don't have any objection

[gleidi-suse]

@Vogtinator I'm merging this please let us know if you find any regression, thank you very much