Converting remaining service tests from Cypress to Playwright

[nataliekorzh]

• Identified the issue which this PR solves.
• Read the CONTRIBUTING document.
• Code builds clean without any errors or warnings.
• Added appropriate tests for any new functionality.
• All new and existing tests passed.
• Added comments in the code, where necessary.
• Ran make check to catch common errors. Fixed any that came up.

Description:
This PR converts the rest of the service test previously written for Cypress to Playwright.
Specifically covers:

• Creating a new type and deleting an integration key
• Creating, editing and deleting a heartbeat monitor
• Navigating to the metrics
• Creating, acknowledging, and closing an alert
• Editing and deleting a label
• Searching for a service by label key and value

Which issue(s) this PR fixes:
Part of #2847
Follow-up to #2913 and #2922

Out of Scope:
There are three tests remaining in the services file that are still only written for Cypress:

• Two (one for labels and one for integration keys) tests that rely on admin access to manipulate the config. These will be converted in a separate test suite dedicated to turning off admin features and testing that they no longer appear in the UI
• One (metrics) test that relies on the harness and fast forwarding to acknowledge and close alerts after a certain amount of time.