[Unified Instance Tagging]: Add cloud_metadata to DBM event payloads

[jmeunier28]

What does this PR do?

This PR adds cloud_metadata fields to all DBM event payloads, this adds necessary context in order link DBM event data with related cloud resource data in our backend.

The goal here is to allow customers to filter event data by a new universal tag database_instance, which will be applied across DBM and cloud telemetry.

[codecov]

Codecov Report

Merging #14313 (b9e397f) into master (4e56d12) will increase coverage by 0.00%.
The diff coverage is n/a.

Flag	Coverage Δ
postgres	92.24% <ø> (+0.25%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[github-actions]

Test Results

     28 files   -      545       28 suites   - 545   46m 39s ⏱️ - 4h 24m 44s
   187 tests  -   5 102     186 ✔️  -   4 938    1 💤  -      79  0 ❌  - 10 
2 632 runs   - 12 282  2 548 ✔️  - 10 221  84 💤  - 1 976  0 ❌  - 10 

Results for commit b9e397f. ± Comparison against base commit 4e56d12.

This pull request removes 5102 tests.

active_directory.tests.test_active_directory ‑ test_basic_check
active_directory.tests.test_unit ‑ test
activemq.tests.test_check ‑ test_activemq_metrics
activemq.tests.test_check ‑ test_artemis_metrics
activemq_xml.tests.test_activemq_xml ‑ test_e2e
activemq_xml.tests.test_activemq_xml ‑ test_integration
aerospike.tests.test_aerospike ‑ test_check
aerospike.tests.test_aerospike ‑ test_e2e
aerospike.tests.test_aerospike ‑ test_metrics_warning
aerospike.tests.test_aerospike ‑ test_openmetrics_e2e
…