Add page limit tests to search requests

[ryaplots]

Summary

References https://thethingsindustries.slack.com/archives/C06UQSMPB/p1730378188247159

Changes

• Add page limit tests to entity search requests

Testing

Steps

Running tests

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• Testing: The steps/process to test this feature are clearly explained including testing for regressions.
• Infrastructure: If infrastructural changes (e.g., new RPC, configuration) are needed, a separate issue is created in the infrastructural repositories.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.

[nicholaspcr]

Looks good to me.

A small nit is that it would be more interesting to have only 9 instead of 15 simply to have the second page of the <entity_type>_PageLimit tests not be maximum value.

Meaning that under the default value the first page would contain 7 items but the second page would have less (2 items)