Modification in the Contributors.ts file improving efficiency readability and maintainability.

[ritankarsaha]

Describe the bug

• Currently, the code inside the next and error callbacks is very similar. We can refactor this by creating a helper function to reduce redundancy.
• Using distinctUntilChanged will prevent unnecessary filtering when the search input hasn't changed, optimizing performance by reducing the number of times filterProfiles is called.
• Adding checks within the nextPage and prevPage methods will ensure that page numbers stay within valid bounds, enhancing readability and reducing the need for the if statement in filterProfiles
• Extract logic for filtering by search text and repository into separate functions for better readability.
• In case contributors or this.profiles is undefined, default them to an empty array to avoid potential null/undefined issues.

To Reproduce Steps to reproduce the behavior:

1. Go to webiu-ui of the webiu folder which is basically the frontend portion of the project.
2. Click on contributors.component.ts file there
3. See errors / modifications that are to be performed

Expected behavior The implementations of all these modifications will ensure that the codebase has enhanced efficiency, readability, and maintainability

Desktop (please complete the following information):

• OS: [MAC OS]
• Browser [CHROME]
• Version [LATEST VERSION]

[ritankarsaha]

Please assign this issue to me. I have fixed this issue and also opened a PR #93 for the same.