Don't clear selected log entry in structured logs if filters are removed

[tlmii]

Currently the log entry is cleared if the filters change in any way. That's not strictly necessary if filters are only removed - the selection is necessarily still in the resulting set.
 
Original comment: #2913 (comment)

I think this could be improved by only clearing the selection if a filter is added/changed, and not if a filter is removed.
For example:

• Removing the text filter on resources/structured logs
• Removing an advanced filter on the structured logs
• Removing type filter on resources
• Removing level filter on structured logs

[samsp-msft]

Nice to have usability fix for 9.0, but can ship without

[leslierichardson95]

@leslierichardson95 tag this as a filter / sorting story issue later