accept a list for skip all metrics matching a label

[steveny91]

What does this PR do?

This PR is in conjunction with a PR to change the config model for the exclude_metrics_by_label. Currently this params accepts both a dict and a list:

{
  "target_label_key": true,
  "target_label_value_list": ["bar", "baz"]
}

But this change allows for the below to keep the same behavior of existing configs.

{ 
  "target_label_key": "true",
  "target_label_key": ["true"],
  "target_label_value_list": ["bar", "baz"]
}

I think it aligns it more to the below:
#21583

I think the config example will change from:

   exclude_metrics_by_labels:
     worker: true
     pid:
     - '23'
     - '42'

to

   exclude_metrics_by_labels:
     worker: 
     - true
     pid:
     - '23'
     - '42'

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.11%. Comparing base (bcd706c) to head (8f6a3c4).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

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[datadog-official]

⚠️ Tests

⚠️ Warnings

❄️ 2 New flaky tests detected

test_common_metrics[False] from test_pg_integration.py (Datadog)

Some metrics are collected but not asserted:
Asserted Metrics:
	- dd.postgres.operation.time
	- postgresql.activity.wait_event
	- postgresql.archiver.archived_count
	- postgresql.archiver.failed_count
	- postgresql.before_xid_wraparound
	- postgresql.bgwriter.buffers_alloc
	- postgresql.bgwriter.buffers_backend
	- postgresql.bgwriter.buffers_backend_fsync
...

test_statement_metrics_and_plans[master-EXEC encryptedProc-expected_queries_patterns2-param_groups2-5-True-True-True-False-encryptedproc] from test_statements.py (Datadog)

missing expected matching rows
assert 0 == 1
 +  where 0 = len([])
 +  and   1 = len([''])

ℹ️ Info

🧪 All tests passed

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