Bulk actions on Message Table Widget consumes a non trivial amount of valuable space

Bulk actions have been [added to the message table widget](https://github.com/Graylog2/graylog2-server/pull/25318). This works well on the search page. However, for dashboards, using the message table widget now adds a non trivial amount of valuable space. This causes less data and less value to be delivered via Graylog Dashboards.

## Expected Behavior

Space consumed is considered. Bulk actions is either hidden until needed or configurable to remove if the user doesn't need/want it.

## Current Behavior

Valuable space is consumed and cannot be configured/removed.

## Possible Solution

## Steps to Reproduce (for bugs)

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## Context

## Your Environment

* Graylog Version:
* Java Version:
* OpenSearch Version:
* MongoDB Version:
* Operating System:
* Browser version:

## Checklist
[] This issue fix need to be backported.
[] Does this issue have **security** implications?