[feature] Add ability to filter out (or in) certain applications

[kigster]

On a large site with 10s-50 applications, it would be super helpful to have a configuration where a regular expression could be specified that either excludes or includes matching applications.

For example:

Filter applications:

(o)  Include matching  OR  ( ) exclude matching
Regular Expression [                                   ]

If I selected 'include matching' and put "prod" in the text input area, then only apps matching the string "prod" would be included in the dropdown, but staging / development wouldnt.