Remove deprecation warning from --block-txs-selection-max-time still used in PoS networks

[fab-10]

PR description

block-txs-selection-max-time option can be still used to limit the max time a block selection job can run for PoS networks

Fixed Issue(s)

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• Considered documentation and added the doc-change-required label to this PR if updates are required.
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[Copilot]

Pull request overview

Removes the deprecation messaging around --block-txs-selection-max-time and reframes it as a PoS-specific transaction-selection time limit.

Changes:

• Renamed “non-PoA” transaction selection max time configuration to “PoS” across core config, CLI options, and tests.
• Removed the PoW deprecation prefix from the CLI help text for --block-txs-selection-max-time.
• Updated CLI/config mapping and unit tests to use the new PoS naming.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
ethereum/core/src/main/java/org/hyperledger/besu/ethereum/core/MiningConfiguration.java	Renames default constant and accessor from non-PoA to PoS and updates duration selection logic.
app/src/main/java/org/hyperledger/besu/cli/options/MiningOptions.java	Removes deprecation prefix and renames the backing field/mapping to PoS.
app/src/test/java/org/hyperledger/besu/cli/options/MiningOptionsTest.java	Updates assertions to new PoS accessor/constant names.
ethereum/blockcreation/src/test/java/org/hyperledger/besu/ethereum/blockcreation/LondonFeeMarketBlockTransactionSelectorTest.java	Updates imports/usages to new PoS default constant.
ethereum/blockcreation/src/test/java/org/hyperledger/besu/ethereum/blockcreation/AbstractBlockTransactionSelectorTest.java	Updates imports/usages and builder setter to new PoS naming.

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