Add E2E test environment for Teleport

[NouemanKHAL]

What does this PR do?

Adds a E2E test environment for Teleport using Caddy server with the metric mocks.
Adds a helper python script to randomize the mock values.

Motivation

Generate metrics for testing in internal Orgs.

Additional Notes

To run the helper script:

cd teleport/tests/docker/caddy
python metrics_mock_randomizer.py fixtures/metrics/get.txt &

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Changelog entries must be created for modifications to shipped code
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 4 lines in your changes missing coverage. Please review.

Project coverage is 87.63%. Comparing base (32a93c3) to head (381e84e).
Report is 7 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
teleport	98.16% <77.77%> (-1.46%)	⬇️

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[HadhemiDD]

The E2E test seems to fail : link
If this is expected and it is just a flaky test, can you mark it as flaky? Otherwise try to fix it