add task ID to audit logging if `X-Opaque-Id` header was set

[elasticmachine]

Original comment by @jpcarey:

Describe the feature: Add X-Opaque-Id header / task ID to security audit logging (if the value is set)

#27764

[albertzaharovits]

X-Opaque-Id has been added to the audit logging in #31878 and #32260 .
Task Id is still TODO but should not be accessible to implement, see

elasticsearch/x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/action/filter/SecurityActionFilter.java

Line 72 in 6daf811

public <Request extends ActionRequest, Response extends ActionResponse> void apply(Task task, String action, Request request,

[albertzaharovits]

Added in #31878 and #32260 .