Eng 2885 create and test metric and check routes

[eunice-chan]

Describe your changes and why you are making these changes

Node Metric & Check get and content-get routes.

Same issue with content-get tests as the existing content-get routes so added the content-get tests to the task to investigate the error (ENG-2943)

Related issue number (if any)

ENG-2885
ENG-2943

Checklist before requesting a review

• I have created a descriptive PR title. The PR title should complete the sentence "This PR...".
• I have performed a self-review of my code.
• [N/A] I have included a small demo of the changes. For the UI, this would be a screenshot or a Loom video.
• [N/A] If this is a new feature, I have added unit tests and integration tests.
• I have run the integration tests locally and they are passing.
• I have run the linter script locally (See python3 scripts/run_linters.py -h for usage).
• [N/A] All features on the UI continue to work correctly.
• Added one of the following CI labels:
  • run_integration_test: Runs integration tests
  • skip_integration_test: Skips integration tests (Should be used when changes are ONLY documentation/UI)

[agiron123]

Code looks good, but could use a little cleanup, particularly in the area of removing comments before it's good to go.

[likawind]

Great job! Appreciate again for adding all tests. I have a couple of naming / organization comments but it should be good to go once these comments are addressed!

[likawind]

Great job! Appreciate again for adding all tests. I have a couple of naming / organization comments but it should be good to go once these comments are addressed!