Redis discovery

[greatestusername]

Description:
Adds discovery mode tests and configs for redis receiver

Link to Splunk idea:
No idea link. Internal contribution

Testing:

• Added new integration bundled test and test data
• verified that existing redis integration tests work as intended

Documentation:

[greatestusername]

Come on tests! (especially the windows tests that likely wont work because they require WSL)

Tell me what's broken in our workflow that works on my local!

[greatestusername]

argle new tests to investigate :D

[rmfitzpatrick]

Mind updating the readme https://github.com/signalfx/splunk-otel-collector/blob/main/internal/confmapprovider/discovery/README.md#discovery-mode?

[greatestusername]

Mind updating the readme https://github.com/signalfx/splunk-otel-collector/blob/main/internal/confmapprovider/discovery/README.md#discovery-mode?

can do!