slack-19.0: skip tests that will fail on v15 downgrade testing

[timvaillancourt]

Description

This PR addresses several query serving CI failures when upgrade/downgrade testing with slack-15.0 VTGates that don't have certain functionality

For context: v18 was used as the previous version because upstream's release-19.0 branch successfully downgrades with v18

Example failures below:

2025-02-10T15:04:33.0364151Z === RUN   TestGroupBy
2025-02-10T15:05:33.1593242Z     aggregation_test.go:119: 
2025-02-10T15:05:33.1595331Z         	Error Trace:	/home/runner/work/vitess/vitess/go/test/endtoend/utils/cmp.go:201
2025-02-10T15:05:33.1596608Z         	            				/home/runner/work/vitess/vitess/go/test/endtoend/utils/cmp.go:65
2025-02-10T15:05:33.1598036Z         	            				/home/runner/work/vitess/vitess/go/test/endtoend/vtgate/queries/aggregation/aggregation_test.go:119
2025-02-10T15:05:33.1598782Z         	Error:      	Received unexpected error:
2025-02-10T15:05:33.1601385Z         	            	unsupported: in scatter query: complex order by expression: id6 + id7 (errno 1235) (sqlstate 42000) during query: select id6+id7, count(*) k from t3 group by id6+id7 order by k
2025-02-10T15:05:33.1602260Z         	Test:       	TestGroupBy
2025-02-10T15:05:33.1602942Z         	Messages:   	[Vitess Error] for query: select id6+id7, count(*) k from t3 group by id6+id7 order by k
2025-02-10T15:05:33.1797086Z --- FAIL: TestGroupBy (60.14s)

This complex order-by expression isn't in v15 tests, skipping it

And:

2025-02-10T15:24:12.1300969Z === RUN   TestDerivedAggregationOnRHS
2025-02-10T15:24:12.1385703Z     derived_test.go:63: 
2025-02-10T15:24:12.1386538Z         	Error Trace:	/home/runner/work/vitess/vitess/go/test/endtoend/utils/cmp.go:201
2025-02-10T15:24:12.1388427Z         	            				/home/runner/work/vitess/vitess/go/test/endtoend/vtgate/queries/derived/derived_test.go:63
2025-02-10T15:24:12.1389225Z         	Error:      	Received unexpected error:
2025-02-10T15:24:12.1393316Z         	            	using aggregation on top of a *planbuilder.orderedAggregate plan is not yet supported (errno 1235) (sqlstate 42000) during query: select d.a from music join (select id, count(*) as a from user) as d on music.user_id = d.id group by 1
2025-02-10T15:24:12.1394653Z         	Test:       	TestDerivedAggregationOnRHS
2025-02-10T15:24:12.1395738Z         	Messages:   	[Vitess Error] for query: select d.a from music join (select id, count(*) as a from user) as d on music.user_id = d.id group by 1
2025-02-10T15:24:12.1419041Z --- FAIL: TestDerivedAggregationOnRHS (0.01s)

plan is not yet supported == skip it

And:

2025-02-10T15:24:37.3112453Z === RUN   TestFoundRows
2025-02-10T15:25:37.3365607Z     found_rows_test.go:48: 
2025-02-10T15:25:37.3366787Z         	Error Trace:	/home/runner/work/vitess/vitess/go/test/endtoend/vtgate/queries/foundrows/found_rows_test.go:48
2025-02-10T15:25:37.3367648Z         	Error:      	Received unexpected error:
2025-02-10T15:25:37.3368822Z         	            	schema tracking didn't mark table ks_found_rows.t2 as authoritative until timeout
2025-02-10T15:25:37.3369445Z         	Test:       	TestFoundRows
2025-02-10T15:25:37.3420839Z --- FAIL: TestFoundRows (60.03s)
2025-02-10T15:25:37.3421157Z FAIL

We don't run schema tracking yet, so 🧹

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[frouioui]

For this test, it makes sense. Support for the query was added in v18 via vitessio#13750 after we saw it was failing on vitessio#11703.

[frouioui]

This also makes sense, support for it was added in v17.0 (vitessio@bedcf51#diff-807c83ede43d6ba771029fc11ac076d6f9c705430df37df98a56205b6eeb81b1) via vitessio#12994

[timvaillancourt]

@frouioui thanks for confirming!