[rush] deferredInstallationScripts & --ignore-scripts

[chengcyber]

Summary

This PR implements "two stage install" proposal. close https://github.com/microsoft/rushstack/issues/3530

Details

This feature is now behind a flag in experiments.json: "deferredInstallationScripts": true

Workflow now:

1. Dividing "rush install/update" into two stage install when using pnpm & "useWorkspaces" on implicitly.
2. During two stage install, '--ignore-scripts' is pushed as a cli parameter to "pnpm install".
3. After "pnpm install" successfully, if "--ignore-scripts" is not specified explicitly by user, run "pnpm rebuild --pending"

Goal: faster retries for install lifecycle scripts: If step3 fails, such as encountering an error in a "postinstall" scripts, rerun "rush install" will skip step2, which gets a faster retry on failed scripts.

How it was tested

Use rushstack repo for example

1. rush --debug install -t rush

two stage install works :)

2. rush --debug install -t rush-lib

Because -t rush-lib is a subset of -t rush, stage1(pnpm install w/ --ignore-scripts) was skipped, and stage2(pnpm rebuild --pending) was run. At the same time, there is no pending rebuild scripts to run. rebuild finished in seconds.

[chengcyber]

Updates 2022/8/7:

1. rebase latest main branch
2. rename pushRebuildArgs to pushPnpmRebuildCommandArgs
3. add a comment on Stage 1
4. throw error when specifying --ignore-scripts in non-pnpm repos
5. refactor last-install flag and add a individual isSelectedProjectInstalled method

[chengcyber]

Update: Sync this branch with the latest main branch

[chengcyber]

Update:

1. merge the latest main branch
2. update change log comment