fix(docs): improve the contribution guidelines

[wellwelwel]

This PR improves the Contributing Guidelines based in some recent events.

---

c8

1. Force all files to be checked in the coverage test using the all option.

• Files that were ignored (0%):
  • lib/packets/binlog_query_statusvars.js
  • lib/results_stream.js

2. Include a manual coverage check:

• When submitting a PR with the base before Codecov was implemented, it will not verify coverage.
  • Example: #2518
    • 

---

Contributing Guidelines

1. Add two new sections to Development:

Commits and Pull Request Titles

To ensure a clean commit history pattern, please use the Conventional Commits format.

Prefixes that will trigger a new release version:

• fix: for patches, e.g., bug fixes that result in a patch version release.
• feat: for new features, e.g., additions that result in a minor version release.

Examples:

• fix: message
• feat: message
• docs: message
• fix(module): message
• feat(module): message
• etc.

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Including Tests

Fixes

Where possible, provide an error test case that your fix covers.

Features

Please ensure test cases to cover your features.

2. Include the npm run coverage-test to Running Tests section.
3. Add a simple tip to run a single test in Running Tests section:

You can also run a single test by performing node ./test/path-to-test-file.

---

Codecov

I've changed the target from 90% to 89%, because after specifying the exact paths and ensuring that all files are checked, the current score (90.31%) is too close to the limit.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.31%. Comparing base (a9c6c3e) to head (519169c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@ ## master #2552 +/- ## ========================================== - Coverage 91.20% 90.31% -0.89%  ========================================== Files 69 71 +2 Lines 15547 15700 +153 Branches 1331 1332 +1 ========================================== Hits 14179 14179 - Misses 1368 1521 +153 

Flag	Coverage Δ
compression-0	90.31% <ø> (-0.89%)	⬇️
compression-1	90.31% <ø> (-0.89%)	⬇️
tls-0	89.83% <ø> (-0.89%)	⬇️
tls-1	90.13% <ø> (-0.89%)	⬇️

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[wellwelwel]

@sidorares, treating this as a fix to trigger a new release for #2542.

I thought that by changing the PR title, it would automatically update the commit message when it was squashed, but this only applies to multiple commits.

[wellwelwel]

Since it changes the Contributing.md, I'll keep it for you 🙋🏻‍♂️

[sidorares]

somehow missed it, lgtm