chore(discovery): use target.agent field for determining connection type (backport #1321)

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Related to #1320
See cryostatio/cryostat#598

Description of the change:

This change adds allows a match expression example to be copied to the clipboard...

Motivation for the change:

This change is helpful because users may want to copy the example for easier use...

How to manually test:

1. Run CRYOSTAT_IMAGE=quay.io... sh smoketest.sh...
2. ...

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This is an automatic backport of pull request #1321 done by [Mergify](https://mergify.com).

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