Unify auto-refresh behaviour by disabling auto-refresh on search bar form changes

[linuspahl]

Description

Motivation and Context

As described in https://github.com/Graylog2/graylog-plugin-enterprise/issues/5896 the behaviour of the search auto-refresh can be confusing.

1. When you make a change, do not submit the form and start the auto-refresh, the search does not contain the latest change.
2. When you make a change while the auto-refresh is active, the search does not contain the latest change

With this PR we are now:

• In case 1 submitting the change when starting the auto-refresh
• in case 2 stoping the auto-refresh, when making changes while it is active. This way the behaviour is unified with similar cases. We also tested submitting the changes in this case, but always ran into issues with this approach.

Fixes https://github.com/Graylog2/graylog-plugin-enterprise/issues/5896