Remove unused code for pre-computed hashes in join nodes

[raunaqmorarka]

Description

This code became unused after removal of HashGenerationOptimizer

Additional context and related issues

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## Section
* Fix some things. ({issue}`issuenumber`)

[Copilot]

Pull Request Overview

This PR removes all remnants of pre-computed hash symbol handling from join planning and execution after the HashGenerationOptimizer was removed. Primary changes include eliminating hash‐related constructor parameters, fields, methods, and imports across plan copying, execution planning, code generation, and operator implementations.

• Drop unused hash symbol arguments in plan copying and local execution planner.
• Remove precomputed hash fields and constructor logic in JoinCompiler, SimplePagesHashStrategy, and related factories.
• Strip hash‐block handling from JoinProbe, HashBuilderOperator, HashSemiJoinOperator, ChannelSet, and other join operators.
• Update PagesIndex and index/operator factories to only use join channels (no hash channel).

Reviewed Changes

Copilot reviewed 108 out of 108 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
core/trino-main/src/main/java/io/trino/sql/planner/PlanCopier.java	Remove left/right hash symbol params from join copy
core/trino-main/src/main/java/io/trino/sql/planner/LocalExecutionPlanner.java	Remove probe/index hash channel computation
core/trino-main/src/main/java/io/trino/sql/gen/JoinCompiler.java	Drop hashChannelField and related constructor/method
core/trino-main/src/main/java/io/trino/operator/join/unspilled/JoinProbe.java	Remove probeHashBlock and hash‐based cache logic
core/trino-main/src/main/java/io/trino/operator/join/unspilled/HashBuilderOperator.java	Eliminate preComputedHashChannel usage
core/trino-main/src/main/java/io/trino/operator/join/LookupJoinOperatorFactory.java	Remove probeHashChannel and PrecomputedHashGenerator
core/trino-main/src/main/java/io/trino/operator/join/JoinProbe.java	Strip optional hash block from factory and probe
core/trino-main/src/main/java/io/trino/operator/join/HashBuilderOperator.java	Remove preComputedHashChannel from operator constructors
core/trino-main/src/main/java/io/trino/operator/index/IndexSnapshotBuilder.java	Drop keyOutputHashChannel and its use
core/trino-main/src/main/java/io/trino/operator/index/IndexLookupSourceFactory.java	Remove keyOutputHashChannel field/ctor
core/trino-main/src/main/java/io/trino/operator/index/IndexLoader.java	Remove optional hash channel parameter
core/trino-main/src/main/java/io/trino/operator/function/TableFunctionOperator.java	Eliminate OptionalInt import and hash strategy overloads
core/trino-main/src/main/java/io/trino/operator/WindowOperator.java	Remove OptionalInt import and hash strategy params
core/trino-main/src/main/java/io/trino/operator/StreamingAggregationOperator.java	Strip OptionalInt import and strategy call
core/trino-main/src/main/java/io/trino/operator/SimplePagesHashStrategy.java	Remove precomputedHashChannel logic
core/trino-main/src/main/java/io/trino/operator/SetBuilderOperator.java	Drop hashChannel from factory and operator
core/trino-main/src/main/java/io/trino/operator/PagesIndex.java	Simplify lookup/hash strategy method signatures
core/trino-main/src/main/java/io/trino/operator/OperatorFactories.java	Remove probeHashChannel from join factories
core/trino-main/src/main/java/io/trino/operator/HashSemiJoinOperator.java	Remove probeJoinHashChannel and related branches
core/trino-main/src/main/java/io/trino/operator/ChannelSet.java	Eliminate hash‐block overload of addAll

[losipiuk]

Skimmed. Looks legit.