ci: Modularizing the Github actions workflow for maintainability

[mohanarpit]

Description

This PR refactors the integration-test.yml Github action workflow that is triggered during ok-to-test command. We create centralized workflows for server, client & rts builds. This allows us to create more workflows in the future with ease and without error. It also bring more consistency in the naming convention.

Type of change

• Refactoring code

How Has This Been Tested?

• Tested on personal repository

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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Name	Status	Preview	Updated
appsmith	✅ Ready (Inspect)	Visit Preview	Sep 8, 2022 at 7:19PM (UTC)

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[mohanarpit]

/ok-to-test sha=4fede75

[github-actions]

Tests running at: https://github.com/appsmithorg/appsmith/actions/runs/3017698435.
Workflow: Appsmith External Integration Test Workflow.
Commit: 4fede75.
PR: 16505.