[rush-migrate-subspace-plugin]: add clean subspace feature

[pedro-gomes-92]

Basic Checks

Have you run rush change for this change?

• Yes
• No

If No, please run rush change before, this is necessary.

If adding a new feature, the PR's description includes:

Reason for adding this feature

A lot of subspaces are not being properly managed, where there are a lot of similar, duplicated or unused dependency versions being added to the "common-versions.json". Adding this feature helps developers to rapidly clean their subspace multiple dependency versions, reducing its "pnpm-lock.yaml" file and minimise future issues.

How to use

rush migrate-subspace --clean

Does this PR introduce a breaking change? (check one)

• Yes
• No

Summary

Supports the parameter --clean, to remove a subspace unnecessary dependency versions, reducing its "pnpm-lock.yaml" file and prevent future dependency issues.

Detail

• Removes duplicated dependency versions from "common-versions.json" alternativeAllowedVersions
• Removes unused dependency versions from "common-versions.json" alternativeAllowedVersions
• Removes duplicated dependency versions from "package.json" between devDependencies and dependencies
• Removes superset dependencies from "common-versions.json" alternativeAllowedVersions and updates each proper project "package.json" with the new subset version (e.g. Project P1 contains A@^1.0.0 and Project P2 contains [email protected], the script will remove ^1.0.0 from the "common-versions.json" and update P1 "package.json" to [email protected])

[octogonz]

Approved with some suggestions