feat: add codespace devcontainer

[ChichiCaleb]

Description

Argocd development workflow is great and straightforward, however one might one to quickly start developing without spending much time setting up local cluster and necessary configuration.

Secondly, the developers local development environment might not have sufficient memory and capacity that will ensure seamless development, hence the need for a more efficient and ready to go environment

Requirement

Enable Codespace on forked repo and sync with your local vscode

export CODESPACE=true

Can now run relevant make commands

Fixes #19556

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.81%. Comparing base (47bcb09) to head (7337fd2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #19557      +/-   ##
==========================================
- Coverage   55.83%   55.81%   -0.02%     
==========================================
  Files         316      316              
  Lines       43743    43743              
==========================================
- Hits        24422    24416       -6     
- Misses      16768    16773       +5     
- Partials     2553     2554       +1     

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[christianh814]

@csantanapr Wasn't this something you've worked on?