8984 Allow script log to be filtered

[arthanson]

Fixes: #8984

Added a chit to show log level filter:

[jeremystretch]

We need to convey the currently applied filter on the view. From the screenshot below, it's not apparently what log level is applied (currently "warning") or that there may be messages omitted.

[arthanson]

We need to convey the currently applied filter on the view. From the screenshot below, it's not apparently what log level is applied (currently "warning") or that there may be messages omitted.

Added a chit to show the log-level filter to keep it consistent with rest of filtering displays.

[jeremystretch]

I've made some cosmetic improvements to the threshold selector.

[jeremystretch]

I'm not clear on the distinction between debug and default: Debug is the lowest-ranked level, so shouldn't that be the default?

[arthanson]

The existing LogLevelChoices has default defined so it needs to be mapped, we could filter and remove it from the dropdown but I included it because it is already existing. If we removed it from LogLevelChoices then we would need a migration script to convert old script runs to remove it.