mock: upgrade and port from extended to core (including dependencies)

[reubeno]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• [X] The toolchain has been rebuilt successfully (or no changes were made to it)
• [X] The toolchain/worker package manifests are up-to-date
• [X] Any updated packages successfully build (or no packages were changed)
• [X] Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• [X] Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• [X] All package sources are available
• [X] cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• [X] LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• [X] All source files have up-to-date hashes in the *.signatures.json files
• [X] sudo make go-tidy-all and sudo make go-test-coverage pass
• [X] Documentation has been updated to match any changes to the build system
• [ ] Ready to merge

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Summary

Upgrades mock to a usable version that will run on Azure Linux 3.0 and upgrades it and its required dependencies to core from extended. Since the 2.0 -> 3.0 upgrade, the version of mock present in extended hasn't been able to run correctly.

Change Log

• Upgrade mock and move to core
• Upgrade mock-core-configs and move to core (part of mock)
• Upgrade distribution-gpg-keys and move to core (required by mock)
• Upgrade libuser and move to core (required by mock)
• Add python-backoff (required by mock)
• Upgrade python-pyroute2 and move to core (required by mock)
• Add python-rpmautospec-core (required by mock)
• Upgrade python-templated-dictionary and move to core (required by mock)
• Upgrade usermode and move to core (required by mock)

Does this affect the toolchain?

No.

Test Methodology

Local build + buddy build.

[reubeno]

@PawelWMS thanks for all the feedback on this PR--definitely some good learning for me along the way.

When you get a chance, would you please look at the updates I made to see if they address your questions and concerns? I know there's a conflict with the license map right now, but I'm inclined to hold off on (re-)resolving that / (re-)sync'ing until getting a general thumbs up from you on the meaningful changes herein.

(As a side note, is there something we could do to decrease conflicts on LICENSES-MAP.md? Even splitting up the giant table cells into multiple rows on multiple textual lines would likely decrease conflicts and enable auto-merging without sacrificing the actual contents. Would there be support for doing that?)