ci: recreate some snapshot tests (#14962)

## Description

[This PR](#14860) changed
some code (`_dd.py.partial_flush` tag) that affects some snapshot tests
where the json files were not updated (and needed removing that line).

Also: changed the corresponding suitespec.yml so the `ci_visibility`
suite is run when the corresponding snapshot json files are modified.

## Testing

Tested that those tests pass now 

## Risks

None

## Additional Notes

None

---------

Co-authored-by: Brett Langdon <brett.langdon@datadoghq.com>

Author: gnufede

tests/ci_visibility/suitespec.yml

@@ -29,7 +29,9 @@ suites:
       - '@codeowners'
       - '@unittest'
       - '@freezegun'
+      - '@tracing'
       - tests/ci_visibility/*
+      - tests/snapshots/test_api_fake_runners.*
     runner: riot
     snapshot: true
   dd_coverage:
@@ -84,6 +86,7 @@ suites:
       - '@ci_visibility'
       - '@coverage'
       - '@freezegun'
+      - '@tracing'
       - tests/contrib/unittest/*
       - tests/snapshots/tests.contrib.unittest.*
     runner: riot