tx/rm_stm: remove support for stale snapshot versions

[bharathv]

Remove dead code. These snapshot versions (and related code) are no longer relevant going forward.

Backports Required

• none - not a bug fix
• none - this is a backport
• none - issue does not exist in previous branches
• none - papercut/not impactful enough to backport
• v24.3.x
• v24.2.x
• v24.1.x

Release Notes

• none

[vbotbuildovich]

Retry command for Build#61698

please wait until all jobs are finished before running the slash command

/ci-repeat 1
tests/rptest/tests/alter_topic_configuration_test.py::AlterConfigMixedNodeTest.test_alter_config_shadow_indexing_mixed_node@{"incremental_update":true}
tests/rptest/tests/shard_placement_test.py::ShardPlacementTest.test_upgrade
tests/rptest/tests/alter_topic_configuration_test.py::AlterConfigMixedNodeTest.test_alter_config_shadow_indexing_mixed_node@{"incremental_update":false}

[vbotbuildovich]

CI test results

test results on build#61698

test_id	test_kind	job_url	test_status	passed
gtest_raft_rpunit.gtest_raft_rpunit	unit	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd39-9e21-4e24-a1f3-0c342930ed31	FLAKY	1/2
rptest.tests.alter_topic_configuration_test.AlterConfigMixedNodeTest.test_alter_config_shadow_indexing_mixed_node.incremental_update=False	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd98-d5c3-4d79-9d63-b20490a1b9c2	FAIL	0/20
rptest.tests.alter_topic_configuration_test.AlterConfigMixedNodeTest.test_alter_config_shadow_indexing_mixed_node.incremental_update=False	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd9e-f587-41cc-9bc6-169fa60d758a	FAIL	0/20
rptest.tests.alter_topic_configuration_test.AlterConfigMixedNodeTest.test_alter_config_shadow_indexing_mixed_node.incremental_update=True	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd98-d5c4-4e77-b15e-d1b9dbc10c22	FAIL	0/20
rptest.tests.alter_topic_configuration_test.AlterConfigMixedNodeTest.test_alter_config_shadow_indexing_mixed_node.incremental_update=True	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd9e-f588-4f31-90ca-9e97786f0f2c	FAIL	0/20
rptest.tests.compaction_recovery_test.CompactionRecoveryUpgradeTest.test_index_recovery_after_upgrade	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd9e-f588-4f31-90ca-9e97786f0f2c	FLAKY	1/2
rptest.tests.datalake.compaction_test.CompactionGapsTest.test_translation_no_gaps.cloud_storage_type=CloudStorageType.S3.catalog_type=CatalogType.REST_HADOOP	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd98-d5c4-4e77-b15e-d1b9dbc10c22	FLAKY	1/4
rptest.tests.datalake.compaction_test.CompactionGapsTest.test_translation_no_gaps.cloud_storage_type=CloudStorageType.S3.catalog_type=CatalogType.REST_JDBC	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd98-d5c2-416d-9612-61edc58a19e4	FLAKY	1/2
rptest.tests.datalake.datalake_e2e_test.DatalakeE2ETests.test_topic_lifecycle.cloud_storage_type=CloudStorageType.S3.catalog_type=CatalogType.REST_HADOOP	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd9e-f587-41cc-9bc6-169fa60d758a	FLAKY	1/2
rptest.tests.e2e_shadow_indexing_test.EndToEndHydrationTimeoutTest.test_hydration_completes_on_timeout	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd9e-f586-4bb2-8801-9f63bab02e8b	FLAKY	1/2
rptest.tests.shard_placement_test.ShardPlacementTest.test_upgrade	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd98-d5c2-4324-804c-b5cff981c4d2	FAIL	0/20
rptest.tests.shard_placement_test.ShardPlacementTest.test_upgrade	ducktape	https://buildkite.com/redpanda/redpanda/builds/61698#0194dd9e-f587-41cc-9bc6-169fa60d758a	FAIL	0/20

[dotnwat]

Remove dead code. These snapshot versions (and related code) are no longer relevant going forward.

it might be useful to understand how we know we wouldn't encounter them somewhere on some cluster, or how we know if they were to exist that they wouldn't be an issue after this change.