cc_ansible: install_method: pip cannot find ansible-pull command path

[AliyevH]

Proposed Commit Message

1. site path ~/.local must be added to env PATH if self.run_user is defined.
2. bootstrap pip if required - must be run before install not after.
3. is_installed - pip list command must use --user if self.run_user is defined.
4. [sys.executable, "-c", "'import site; print(site.getuserbase())'"] - incorrect
5. [sys.executable, "-c", "import site; print(site.getuserbase())"] - correct. single quotes inside double quotes behaves incorrectly. and returns nothing.


Fixes GH-5720

Additional Context

Test Steps

Merge type

• Squash merge using "Proposed Commit Message"
• Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number (#<PR_NUM>)