@W-22769624: add WSC 2.2 docs

[acurci-at-mulesoft]

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[acurci-at-mulesoft]

Hi @kevintroller ,

This PR adds the docs for mule-wsc-connector 2.2.0.

The reason for this version is that web-service-consumer 2.2 is now fips140-3 compatible.
We didn't mention it in the docs but it is the change that triggered this minor.

Summary of changes:

1. New version directory web-service-consumer/2.2/
Cloned from 2.1/. Antora version and display_version bumped to 2.2.
All other pages (index, config-topics, examples, reference, studio, xml-maven, examples) are identical to 2.1.

2. web-service-consumer-upgrade-migrate.adoc — preserved + extended
- Title bumped to "Version 2.2" (was "2.1").
- All existing 1.x → 2.x migration content preserved unchanged (Java 17, Spring 6, upgrade steps, troubleshooting, revert).
- New subsection added: === Additional Changes in 2.2, listing:
• New WSC:SECURITY error type usable in <error-handler> blocks.
• soap-engine dependency upgraded to 2.4.0 with security improvements (XML parsing hardened by default).

3. web-service-consumer-troubleshooting.adoc — new system property entry
Added a subsection under "Troubleshooting Systems Properties" for the new mule.soap.xml.disableXxeProtection system property (default false). Documents how to re-enable DOCTYPE and external entity processing for legacy clients that need it, with a "not recommended" warning consistent with the runtime log warning.