chore(deps): Removed the lerna dependency and all the usage of it

[sdangol]

Summary

This PR removes the lerna dependency from the project and also removes all the places from where it was mentioned.

Changes

Please provide a summary of what's being changed

• Removed lerna dependency from package.json and ran npm install to update package-lock.json
• Remove the lerna.json config which was used by lerna
• Removed mentions of lerna from .gitignore and .github/boring-cyborg.yml

Please add the issue number below, if no issue is present the PR might get blocked and not be reviewed

Issue number:
#4169

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[dreamorosi]

Thank you! I'm so happy to see this gone!

[github-actions]

@aws-powertools/lambda-typescript No related issues found. Please ensure 'pending-release' label is applied before releasing.

[svozza]

Great work @swopnildangol!