Re-add options to QueryService interface

[mhamza15]

Description

#19007 updated the QueryService interface with a new Session interface that contains the session UUID and the existing ExecuteOptions. Since the options parameter was now redundant and can be pulled from the Session directly, it was removed. This caused a lot of unnecessary changes, but also introduced a race condition in scatter_conn.go:

	allErrors := stc.multiGoTransaction(
		// ...
		func(rs *srvtopo.ResolvedShard, i int, info *shardActionInfo) (*shardActionInfo, error) {
			// ...

			// Goroutine A reading session
			if session != nil && session.Session != nil {
				opts = session.Options
			}

			// Goroutine B writing session
			if opts == nil && fetchLastInsertID {
				opts = &querypb.ExecuteOptions{FetchLastInsertId: fetchLastInsertID}
+				session = econtext.NewSafeSession(&vtgatepb.Session{Options: opts})
			}

			// ...
		}
	)

This PR removes GetOptions from the new Session interface and adds back the options parameter to the QueryService interface. This allows each goroutine in that scatter_conn.go logic to keep its own local opts and not overwrite the shared session, reverting the logic to how it was before.

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

AI Disclosure

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[codecov]

Codecov Report

❌ Patch coverage is 73.21429% with 45 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.89%. Comparing base (7a3acd5) to head (95086f2).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
go/vt/vtcombo/tablet_map.go	0.00%	9 Missing ⚠️
go/vt/vttablet/tabletconntest/fakequeryservice.go	66.66%	7 Missing ⚠️
go/vt/vttablet/sandboxconn/sandboxconn.go	78.57%	6 Missing ⚠️
go/vt/vtgate/scatter_conn.go	75.00%	4 Missing ⚠️
go/vt/vttablet/grpctabletconn/conn.go	77.77%	4 Missing ⚠️
go/vt/vttablet/queryservice/wrapped.go	77.77%	4 Missing ⚠️
go/vt/vttablet/grpcqueryservice/server.go	66.66%	3 Missing ⚠️
go/vt/vtexplain/vtexplain_vttablet.go	66.66%	2 Missing ⚠️
.../queryservice/fakes/stream_health_query_service.go	0.00%	2 Missing ⚠️
go/vt/vttablet/tabletserver/tabletserver.go	87.50%	2 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19075      +/-   ##
==========================================
- Coverage   69.90%   69.89%   -0.01%     
==========================================
  Files        1612     1612              
  Lines      215817   215789      -28     
==========================================
- Hits       150865   150824      -41     
- Misses      64952    64965      +13     

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