Use - in test collection names

[AlekSi]

Description

Closes #1280.

Readiness checklist

• I added tests for new functionality or bugfixes.
• I ran task all, and it passed.
• I added/updated comments for both exported and unexported top-level declarations (functions, types, etc).
• I checked comments rendering with task godocs.
• I ensured that the title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Assignee, Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated
ferret-db	✅ Ready (Inspect)	Visit Preview	Nov 18, 2022 at 9:12AM (UTC)

[vercel]

Deployment failed with the following error:

Resource is limited - try again in 59 seconds (more than 100, code: "api-deployments-free-per-day").

[codecov]

Codecov Report

Merging #1325 (4964ea4) into main (1dc24a1) will increase coverage by 19.80%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1325       +/-   ##
===========================================
+ Coverage   47.97%   67.78%   +19.80%     
===========================================
  Files         279      279               
  Lines       13500    13500               
===========================================
+ Hits         6477     9151     +2674     
+ Misses       6283     3424     -2859     
- Partials      740      925      +185     

Impacted Files	Coverage Δ
integration/setup/setup.go	87.03% <ø> (ø)
internal/util/testutil/db.go	87.30% <100.00%> (ø)
internal/util/version/version.go	48.52% <0.00%> (-4.42%)	⬇️
internal/clientconn/conn.go	50.00% <0.00%> (+1.00%)	⬆️
integration/helpers.go	87.62% <0.00%> (+1.03%)	⬆️
internal/wire/msg_body.go	38.09% <0.00%> (+1.58%)	⬆️
internal/wire/msg_header.go	71.42% <0.00%> (+2.38%)	⬆️
internal/clientconn/listener.go	83.06% <0.00%> (+2.41%)	⬆️
internal/types/document_validation.go	96.15% <0.00%> (+2.56%)	⬆️
internal/handlers/pg/pgdb/tables.go	64.70% <0.00%> (+2.94%)	⬆️
... and 56 more

Flag	Coverage Δ
integration	63.99% <100.00%> (+25.32%)	⬆️
mongodb	14.18% <100.00%> (-0.03%)	⬇️
pg	53.16% <100.00%> (?)
tigris	36.14% <100.00%> (-0.03%)	⬇️
unit	26.41% <100.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.