fix(discovery): retry failed target connections (backport #1593)

[mergify]

This is an automatic backport of pull request #1593 done by Mergify.
Cherry-pick of bf86535 has failed:

On branch mergify/bp/cryostat-v2.3/pr-1593
Your branch is up to date with 'origin/cryostat-v2.3'.

You are currently cherry-picking commit bf865351.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   src/main/java/io/cryostat/discovery/DiscoveryStorage.java
	modified:   src/main/java/io/cryostat/recordings/JvmIdHelper.java
	modified:   src/test/java/io/cryostat/discovery/DiscoveryStorageTest.java
	modified:   src/test/java/itest/bases/ExternalTargetsTest.java

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   compose/compose-cryostat.yaml
	deleted by us:   compose/compose-vertx-jmx.yaml
	deleted by us:   smoketest-docker.sh
	both modified:   smoketest.sh

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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