Create the JDBC spans as exit spans

[tobiasstadler]

What does this PR do?

JDBC should be exit spans so they can potentially be compressed (see #1847)

Checklist

• This is something else
  • I have updated CHANGELOG.asciidoc

[github-actions]

👋 @tobiasstadler Thanks a lot for your contribution!

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[apmmachine]

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• Start Time: 2022-02-28T15:58:19.315+0000

• Duration: 45 min 5 sec

Test stats 🧪

Test	Results
Failed	0
Passed	2503
Skipped	16
Total	2519

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[felixbarny]

run elasticsearch-ci/docs

[tobiasstadler]

Thank You!