IGNITE-22920 Final cleanup of GridDhtTxFinishRequest

Description

GridDhtTxFinishRequest redundant class members was removed:

GridDhtTxFinishRequest#partUpdateCounters() usage was removed in IGNITE-10078 [1]. Thus, this method seems to be useless.

Getter for GridDhtTxFinishRequest#pendingVers() was removed in [2], but actually it was unused since initial commit.

GridDhtTxFinishRequest#writeVersion() usage was removed before first Ignite release in [3] and as I see GridDistributedTxPrepareRequest#writeVersion() is used instead [4-6].

GridDhtTxFinishRequest#isolation() usages was removed before first Ignite release: see [7, 8].

Links:

https://github.com/apache/ignite/commit/e7a90a445f09b0783918a0b5cfbeddee7102c45e#diff-0b00deac783b25444a9201a862ba487bb1f83de7dd319edd2b02064b8efebbeaL1426 (IgniteTxHandler:1426 left)
https://github.com/apache/ignite/commit/457a9ae4d3b0d6eef6e92a15f5ef79c15ccf1f95#diff-3ef6211e80513fc51e2185d3c1b59378aed8d18d2744e7a0dfa92018fba8d684L310 (GridDhtTxFinishRequest:310 left)
https://github.com/apache/ignite/commit/0354a41b94e891273a06587c6cea95aaee15d995#diff-0b00deac783b25444a9201a862ba487bb1f83de7dd319edd2b02064b8efebbeaL735 (IgniteTxHandler:735 left)
https://github.com/apache/ignite/commit/0354a41b94e891273a06587c6cea95aaee15d995#diff-0b00deac783b25444a9201a862ba487bb1f83de7dd319edd2b02064b8efebbeaR827 (IgniteTxHandler:827 right)
https://github.com/apache/ignite/commit/0354a41b94e891273a06587c6cea95aaee15d995#diff-0b00deac783b25444a9201a862ba487bb1f83de7dd319edd2b02064b8efebbeaR910 (IgniteTxHandler:910 right)
https://github.com/apache/ignite/commit/0354a41b94e891273a06587c6cea95aaee15d995#diff-0b00deac783b25444a9201a862ba487bb1f83de7dd319edd2b02064b8efebbeaR1029 (IgniteTxHandler:1029 right)
https://github.com/apache/ignite/commit/0354a41b94e891273a06587c6cea95aaee15d995#diff-0b00deac783b25444a9201a862ba487bb1f83de7dd319edd2b02064b8efebbeaL1145 (IgniteTxHandler:1145 left)
https://github.com/apache/ignite/commit/0354a41b94e891273a06587c6cea95aaee15d995#diff-0b00deac783b25444a9201a862ba487bb1f83de7dd319edd2b02064b8efebbeaL1292 (IgniteTxHandler:1292 left)

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The Contribution Checklist

[x] There is a single JIRA ticket related to the pull request.
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Notes

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apache / ignite