Fix update with query operator for upsert option

[chilagrow]

Description

Closes #2945.

This is not a finest implementation, it fixes the bug. I'm keeping upsert reorganisation in this issue #3040.

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), Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[codecov]

Codecov Report

Merging #3028 (d19b018) into main (21f9faf) will increase coverage by 0.71%.
The diff coverage is 68.65%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3028      +/-   ##
==========================================
+ Coverage   72.39%   73.11%   +0.71%     
==========================================
  Files         383      386       +3     
  Lines       20840    21155     +315     
==========================================
+ Hits        15088    15468     +380     
+ Misses       4798     4724      -74     
- Partials      954      963       +9     

Impacted Files	Coverage Δ
internal/handlers/pg/msg_findandmodify.go	74.09% <ø> (-6.03%)	⬇️
internal/handlers/sqlite/msg_update.go	77.69% <54.54%> (+14.88%)	⬆️
internal/handlers/pg/msg_update.go	78.40% <66.66%> (+0.82%)	⬆️
internal/handlers/common/filter.go	85.19% <83.33%> (-0.04%)	⬇️

... and 117 files with indirect coverage changes

Flag	Coverage Δ
hana	?
integration	69.42% <68.65%> (-2.98%)	⬇️
mongodb	5.55% <0.00%> (?)
pg	60.33% <50.74%> (-5.97%)	⬇️
shard-1	35.80% <0.00%> (-18.14%)	⬇️
shard-2	55.10% <64.17%> (+5.39%)	⬆️
shard-3	51.75% <50.74%> (-5.32%)	⬇️
sqlite	41.80% <47.76%> (-0.24%)	⬇️
unit	24.21% <0.00%> (?)

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

[chilagrow]

$ task test-integration-sqlite TEST_RUN='TestUpdateFieldSet|TestUpdateFieldSetUpdateManyUpsert|TestUpdateFieldSetUpdateManyNoUpsert|TestUpdateCommandUpsertErrors'
task: [test-integration-sqlite] go test -count=1 -run='TestUpdateFieldSet|TestUpdateFieldSetUpdateManyUpsert|TestUpdateFieldSetUpdateManyNoUpsert|TestUpdateCommandUpsertErrors' -timeout=35m -race=true -tags=ferretdb_debug,ferretdb_hana -shuffle=on -coverpkg=../... -coverprofile=integration-sqlite.txt . -target-backend=ferretdb-sqlite -target-tls -compat-url='mongodb://username:password@127.0.0.1:47018/?tls=true&tlsCertificateKeyFile=../build/certs/client.pem&tlsCaFile=../build/certs/rootCA-cert.pem' -disable-filter-pushdown

ok      github.com/FerretDB/FerretDB/integration        0.784s  coverage: 40.0% of statements in ../...

[chilagrow]

$ task test-integration-sqlite TEST_RUN='TestUpdateFieldSet|TestUpdateFieldSetUpdateManyUpsert|TestUpdateFieldSetUpdateManyNoUpsert|TestUpdateCommandUpsert'

task: [test-integration-sqlite] go test -count=1 -run='TestUpdateFieldSet|TestUpdateFieldSetUpdateManyUpsert|TestUpdateFieldSetUpdateManyNoUpsert|TestUpdateCommandUpsert' -timeout=35m -race=true -tags=ferretdb_debug,ferretdb_hana -shuffle=on -coverpkg=../... -coverprofile=integration-sqlite.txt . -target-backend=ferretdb-sqlite -target-tls -compat-url='mongodb://username:password@127.0.0.1:47018/?tls=true&tlsCertificateKeyFile=../build/certs/client.pem&tlsCaFile=../build/certs/rootCA-cert.pem' -disable-filter-pushdown

ok      github.com/FerretDB/FerretDB/integration        0.831s  coverage: 40.0% of statements in ../...

[chilagrow]

$ task test-integration-sqlite TEST_RUN='TestUpdateFieldSetUpdateManyUpsert|TestUpdateCommandUpsert|TestUpdateFieldCompatSetMulti'
task: [test-integration-sqlite] go test -count=1 -run='TestUpdateFieldSetUpdateManyUpsert|TestUpdateCommandUpsert|TestUpdateFieldCompatSetMulti' -timeout=35m -race=true -tags=ferretdb_debug,ferretdb_hana -shuffle=on -coverpkg=../... -coverprofile=integration-sqlite.txt . -target-backend=ferretdb-sqlite -target-tls -compat-url='mongodb://username:password@127.0.0.1:47018/?tls=true&tlsCertificateKeyFile=../build/certs/client.pem&tlsCaFile=../build/certs/rootCA-cert.pem' -disable-filter-pushdown

ok      github.com/FerretDB/FerretDB/integration        12.979s coverage: 40.0% of statements in ../...

[noisersup]

LGTM

[rumyantseva]

As agreed, we wanted to solve a particular issue, and this solutions looks good to me!