Bypass proxy for cloud metadata

[SylvainJuge]

What does this PR do?

Do not use proxy when querying cloud metadata

Relates to elastic/apm#785

Checklist

• manually testing with -Dhttp.proxyHost= and -Dhttp.proxyPort
• This is a bugfix
  • I have updated CHANGELOG.asciidoc
  • I have added tests that would fail without this fix

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Build stats

• Start Time: 2023-04-13T13:50:14.354+0000

• Duration: 15 min 37 sec

❕ Flaky test report

No test was executed to be analysed.

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