Adding `q=...` to admin filtered image admin listing causes crash.

Issue Summary

If you try to combine ?q= search type URL with filtering by collection in the Image view, you get a crash. (AttributeError at /admin/images/)

  File "/Users/daniel/tmp/search-crash/.v/lib/python3.10/site-packages/wagtail/images/views/images.py", line 96, in get_context_data
    context = super().get_context_data(**kwargs)
  File "/Users/daniel/tmp/search-crash/.v/lib/python3.10/site-packages/wagtail/images/views/images.py", line 67, in get_context_data
    images = images.filter(collection=self.current_collection)

Exception Type: AttributeError at /admin/images/
Exception Value: 'SQLiteSearchResults' object has no attribute 'filter'

(We have a client who wants to be able to search within an image collection, so were exploring options)

Steps to Reproduce

1. Start a new project with wagtail start myproject
2. cd myproject
3. ./manage.py migrate
4. ./manage.py createsuperuser
5. ./manage.py runserver
6. http://localhost:8000/admin/images/?collection_id=1&q=1

Crash.

• I have confirmed that this issue can be reproduced as described on a fresh Wagtail project: (yes)

Technical details

• Python version: 3.8, 3.9, 3.10
• Django version: 3.2, 4.0
• Wagtail version: 2.15, 2.16.1
• Browser version: N/A
• Search backends: SQLLite, Postgres (database backend) and ElasticSearch backends all have this.

e.g:

'SQLiteSearchResults' object has no attribute 'filter'

'Elasticsearch6SearchResults' object has no attribute 'filter'

'PostgresSearchResults' object has no attribute 'filter'

[lb-]

Go for it. Nothing stopping you or anyone picking up a bug to fix. @ParitoshKabra

I would recommend for something like this you start with the unit test, sometimes finding where to add a test can be tricky and PRs must come with a test to ensure won’t break this again in the future.

[lb-]

Thanks for digging into this @ParitoshKabra

1. The search losing the collection is a known issue - https://github.com/wagtail/wagtail/issues/4073 (feel free to investigate)
2. Search indexing by default is basic, it depends on the search backend used. https://docs.wagtail.org/en/stable/topics/search/backends.html - I’m not very skilled in the search area though so maybe that could also be improved

There is also this issue that may be related. https://github.com/wagtail/wagtail/issues/3746