Remove influxdb views and docs

Merged Ryan Cobb requested to merge rc/remove_influx_views_docs into master

What does this MR do?

This MR is part of the deprecation of influxdb. Deprecation will be tracked in #122311 (comment 336258151).

This MR removes all influxdb documentation, views, and apis.

It also moves one setting that was in the Metrics - Influx section to the Metrics - Prometheus section.

Issue: #122311 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • [-] Label as security and @ mention @gitlab-com/gl-security/appsec
  • [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • [-] Security reports checked/validated by a reviewer from the AppSec team
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