Create user in envtool for SQLite

[chilagrow]

Description

This PR includes changes on #4133.
Doing the same as PostgreSQL.

Closes #1877.

Readiness checklist

• I added/updated unit tests (and they pass).
• I added/updated integration/compatibility tests (and they pass).
• I added/updated comments and checked rendering.
• I made spot refactorings.
• I updated user documentation.
• I ran task all, and it passed.
• I ensured that PR title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Milestone (Next), Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.82%. Comparing base (5a5ca29) to head (5d8ddb5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4147      +/-   ##
==========================================
- Coverage   74.31%   73.82%   -0.50%     
==========================================
  Files         353      353              
  Lines       22738    22739       +1     
==========================================
- Hits        16897    16786     -111     
- Misses       4552     4684     +132     
+ Partials     1289     1269      -20     

Files	Coverage Δ
integration/setup/setup.go	81.25% <100.00%> (ø)
internal/handler/commands.go	100.00% <100.00%> (ø)

... and 14 files with indirect coverage changes

Flag	Coverage Δ
filter-true	67.53% <100.00%> (-0.30%)	⬇️
hana-1	?
integration	67.53% <100.00%> (-0.30%)	⬇️
mongodb-1	4.75% <25.00%> (+<0.01%)	⬆️
postgresql-1	48.72% <100.00%> (+0.53%)	⬆️
postgresql-2	50.07% <100.00%> (+1.48%)	⬆️
postgresql-3	48.05% <100.00%> (-1.04%)	⬇️
sqlite-1	47.66% <75.00%> (+0.32%)	⬆️
sqlite-2	48.99% <75.00%> (+1.20%)	⬆️
sqlite-3	47.43% <75.00%> (-0.75%)	⬇️
unit	32.59% <100.00%> (+0.02%)	⬆️

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

[rumyantseva]

LGTM

[chilagrow]

Do not merge tag added to let #4133 merged first