response body support for api security

[christophe-papazian]

Add body response test for api security

• add new capability to tag_value end point of the weblog
• use that to test schema computation of body response for api security
• allow meta tags for api security to be gzip/b64 encoded or not (before it was mandatory, but it's not in the RFC)

Workflow

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Reviewer checklist

• Check what scenarios are modified. If needed, add the relevant label (run-parametric-scenario, run-profiling-scenario...). If this PR modifies any system-tests internal, then add the run-all-scenarios label (more info).
• CI is green
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