[patch][engg]: Add PR review instructions

[juan-arias]

Proposed changes

This pull request updates the .github/copilot-instructions.md file to add a set of basic code review guidelines. These guidelines are intended to enforce consistency and clarity during code reviews.

Code review process improvements:

• Added a new section outlining basic code review guidelines, including rules for language separation, context review, aggregation of minor issues, comment requirements, code replacement standards, and interaction with legacy code.
• Emphasized the need to avoid nitpicking formatting, to always follow repository conventions, to prevent memory leaks or crashes, and to always add unit tests.

Type of change

• Feature work
• Bug fix
• Documentation
• Engineering change
• Test
• Logging/Telemetry

Risk

• High – Errors could cause MAJOR regression of many scenarios. (Example: new large features or high level infrastructure changes)
• Medium – Errors could cause regression of 1 or more scenarios. (Example: somewhat complex bug fixes, small new features)
• Small – No issues are expected. (Example: Very small bug fixes, string changes, or configuration settings changes)

Additional information

[Copilot]

Pull request overview

Adds a new “Basic Code Review Guidelines” section to .github/copilot-instructions.md to standardize how reviews are performed for this repo.

Changes:

• Introduces a concise checklist for review behavior (scope, aggregation of feedback, comment structure).
• Adds guidance around avoiding formatting nits, adhering to repo conventions, and guarding against leaks/crashes.
• Emphasizes expectations around providing actionable recommendations and safe replacements.

[swasti29]

Why other files are missing for this? will it pick from Common Core?

[juan-arias]

Why other files are missing for this? will it pick from Common Core?

@swasti29, the other files were already merged in a previous PR, MSAL was only missing thes updates.