feat: Dynamic handling of deployment templates

[kartik-579]

Description

1. Added support for dynamic handling of charts (user uploaded and devtron owned) in terms of pipeline strategies and app metrics support.
2. Added Deployment type chart for devtron apps.

Fixes #2494

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Unit Test cases
• Local dev Environment
• QA Tests

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?

[gitguardian]

⚠️ GitGuardian has uncovered 3 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secrets in your pull request

GitGuardian id	Secret	Commit	Filename
141558	Generic High Entropy Secret	37a6af1	contrib-chart/reference-chart_4-15-0/env-values.yaml	View secret
2763127	Generic High Entropy Secret	37a6af1	contrib-chart/reference-chart_4-15-0/secrets-test-values.yaml	View secret
5236769	Generic High Entropy Secret	92e3eba	scripts/devtron-reference-helm-charts/deployment-chart_1-0-0/test-values.json	View secret

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