Reducers: Update percentile logic - move percentiles to after standard reducers

[baldm0mma]

What is this feature?

This will update the logic that was first created here. All 99 percentiles show when the reducer options are fetched from the registry - and they also show in order before all other reducer options, making them an issue to bypass. This changes that behavior to only showing the percentiles after the standard field reducers.

NOTE: this PR is in favor of #85831

Why do we need this feature?

UX needed an update.

Who is this feature for?

All users.

Which issue(s) does this PR fix?:

Fixes #85828

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.

[nmarrs]

tested locally and LGTM - UX still does feel a little crowded though but this is an improvement :)

An idea for how to improve this UX in the future would potentially just have a X % percentile option where user can somehow specify a number between 1-99 (dropping the number of options from 99 (bottles of beer on the wall 😬) to 1)

[baldm0mma]

tested locally and LGTM - UX still does feel a little crowded though but this is an improvement :)

An idea for how to improve this UX in the future would potentially just have a X % percentile option where user can somehow specify a number between 1-99 (dropping the number of options from 99 (bottles of beer on the wall 😬) to 1)

100% agree.