Rename params to audit_params to stop overwriting

What does this MR do?

This fixes an issue raised in #225471 (confidential) whereby we were previously setting params to the params allowed by the AuditLogFinder. This doesn't include page which meant further down page no longer existed and we did not paginate the results.

This MR changes the initial overwriting of params with setting a new variable called audit_params instead.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines
• Style guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.

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