feat: add native sidecar container support

[SATYAsasini]

Description

Fixes https://github.com/devtron-labs/sprint-tasks/issues/2867

Checklist:

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR requires documentation updates?
• I've updated documentation as required by this PR.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have tested it for all user roles.
• I have added all the required unit/api test cases.

Does this PR introduce a user-facing change?

Summary by Bito

• Completely removed all environment variable definitions from env_gen.json, including configurations for CD pipelines, ArgoCD sync times, Flux pipeline statuses, and various timeouts and feature flags.
• Replaced the entire JSON array content with a single opening bracket '[', making the file invalid JSON.
• The change affects multiple categories such as CD, with no new configurations added.
• This modification could disable all related CD functionalities if the file is used for environment setup.

[github-actions]

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[github-actions]

Some linked issues are invalid. Please update the issue links:\nIssue # in is not found or invalid (HTTP }404).\n

[github-actions]

Some linked issues are invalid. Please update the issue links:\nIssue # in is not found or invalid (HTTP }404).\n

[github-actions]

Some linked issues are invalid. Please update the issue links:\nIssue # in is not found or invalid (HTTP }404).\n

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud