[Log Parsing Pipelines] filters referencing names whose dots have been replaced with underscores don't work

[raj-k-singh]

We replace dots with underscores for attributes before storing them in the DB right now.

cc @nityanandagohain

[raj-k-singh]

This also affects pipeline processing of extracted attributes if the user names an extracted attributes with dots.

• The preview shows dot based attrib names in simulation output but actual logs have underscore.
• Users can end up adding more processors targeting underscore based attribute names (seen in final logs) even though in the log being processed in the collector the attribute would have a name with a dot.

[raj-k-singh]

We do not replace dots with underscores in logs anymore.
Closing this issue and using https://github.com/SigNoz/engineering-pod/issues/1166 to track migration of existing pipelines and removal of mitigation logic