FIX Add ability to regexp-replace repo.list files

[ukablan-wpc]

Fixes: PAUX-6369 Invalid APT sources produced by source switch procedure

[SandakovMM]

Overall, Could you please tell what the plan is for using regular expression substitution in the next step?
Is it possible to avoid using regular expressions? =)

[ukablan-wpc]

Overall, Could you please tell what the plan is for using regular expression substitution in the next step? Is it possible to avoid using regular expressions? =)

As the bug is related to repo.list lines i.e.

deb [arch=amd64,arm64,armhf] https://packages.microsoft.com/ubuntu/20.04/prod focal main

I am planning to utilize it to replace URLs with version strings inside (and possibly support smart replaces as opposed to SetupAptRepositories)

[SandakovMM]

I am planning to utilize it to replace URLs with version strings inside (and possibly support smart replaces as opposed to SetupAptRepositories)

I see.
I just want to mention that, IMO using regular expressions seems a bit excessive if we are only replacing "20" with "22". However, they are acceptable if we plan to add more complex change.

[kpushkaryov]

I advise to add a setter to the name property to make it not read-only. See the InstallPackages class for an example.

[kpushkaryov]

Also please note failed flake8 checks.

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