M2-5381: Add initial set of linting rules for mobile repository

[sultanofcardio]

📝 Description

🔗 Jira Ticket M2-5381

Note

This is a follow-up to #617

This PR creates an initial set of linting rules with a focus on enhancing code quality and maintainability without imposing strict stylistic guidelines. Each added rule should fall in one of the following categories:

• Potential Bugs Detection: Rules that help identify common coding mistakes that could lead to runtime errors or unexpected behaviour.
• Performance Issues: Rules focused on optimising performance, such as detecting unnecessary re-renders in React components or inefficient database queries.
• Stale Code Identification: Rules to detect unused variables, functions, components, or other elements that can clutter the codebase and reduce maintainability.
• Security Vulnerabilities: Basic security linting rules that flag potentially unsafe coding practices, such as improper handling of user input.

This PR isn't meant to be exhaustive, and so there may be rules I have overlooked that could be added now (or later on as the need arises).

✏️ Notes

Please be generous, but focused with your feedback. I'm especially interested in feedback of this nature:

• Point out rules that you don't think fall into one of the above categories, and you think should be removed
• Highlight out any other rules you think should be removed, and share your reasoning
• Suggest any additional rule that you think should be added now. If it doesn't fall into one of the categories I mentioned, then please share your reasoning

P.S. I'm mindful that this PR is potentially blocked by the work being done on the rn-update-0.73.4 branch. Please let me know if there are additional considerations I should make with that update in mind.

[mbanting]

Did a scan the the rules and it's a good starting set that focuses on detecting potential bugs, performance issues, stale code, and security vulnerabilities. It looks like some of the more subjective or stylistic rules from the previous PR were removed as intended.

As mentioned in another PR and as you stated in the PR description, there will be conflicts with the rn-update-0.73.4 branch although I had a look and it should be relatively straightforward to resolve (at least the .eslintrc.js file).

@BamMironov suggested waiting for that to be merged to dev first before any further linting changes like this. Let's hold off merging this (but still aim to have it in before sprint end) until we have a better idea of where that's at. Alternatively you can already resolve the potential conflicts with that branch here.

By waiting we also give @BamMironov a chance to have a look at this too.

[BamMironov]

Looks good to me!
But yes, let's hold it off till the RN update is merged.

[sultanofcardio]

The changes from rn-update-0.73.4 have been merged into dev, so I rebased and resolved merge conflicts. I'll defer merging this until EOD Monday to give folks a chance to re-review