feat: Restructured existing lambda cards

[practiceteja]

ticket: https://new-relic.atlassian.net/browse/NR-348921

Summary

1. Removed the 'AWS Lambda Telemetry Extension' card.
2. Renamed ‘AWS Lambda’ card to ‘Dashboard and Alert for Lambda’.
3. Removed the search key.

Pre merge checklist

• Did you check you NRQL syntax? - Does it work?
• Did you include a Data source and Documentation reference?
• Are all documentation links publicly accessible?
• Did you check your descriptive content for voice and tone?
• Did you check your descriptive content for spelling and grammar errors?
• Did you review your content with a subject matter expert? (e.g. a Browser agent quickstart is reviewed with a member of the Browser Agent team)

Dashboards

• Does the PR contain a screenshot for each of your dashboards?
• Do your screenshots show data?
• Has the sanitization script been run on each dashboard?

Alerts

• Did you check that your alerts actually work?
• Are you trying to create standalone alerts? Standalone alerts are deprecated. They should only be included in quickstarts.

[CLAassistant]

All committers have signed the CLA.

[sjyothi54]

@practiceteja Hey, everything looks good, but I suggest revising the title for AWS Lambda, as nearly every quickstart includes a dashboard and alerts. It's not advisable to use 'Dashboard and Alert for Lambda' as the title.

Tagging @jcountsNR, as he is the owner of the AWS Lambda Telemetry Extension.
Note: This pull request involves the removal of the AWS Lambda Telemetry Extension quickstart.