[Bug fix] Rule based Auto tagging update rule api

[ruai0511]

Description

Bug fix for https://github.com/opensearch-project/OpenSearch/pull/17797/files

Problem:
When trying to update a rule by just changing its description, the system incorrectly throws a "duplicate rule" error, even though no duplicate rule is created.

When the rule in any api has the same rule id as an existing rule, it means either we are updating an existing rule or we already have the exact same rule in the system under the same doc id (because id is generated based on rule content), in either case, we are not creating duplicate rules so the system shouldn't throw error.

This PR addressed the above issue.

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for 3f2f49e: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[jainankitk]

Seems like a flaky test:

[Test Result](https://build.ci.opensearch.org/job/gradle-check/59101/testReport/) (2 failures / +2)

    [org.opensearch.recovery.RecoveryWhileUnderLoadIT.testRecoverWhileUnderLoadWithDerivedSource {p0={"cluster.indices.replication.strategy":"SEGMENT"}}](https://build.ci.opensearch.org/job/gradle-check/59101/testReport/junit/org.opensearch.recovery/RecoveryWhileUnderLoadIT/testRecoverWhileUnderLoadWithDerivedSource__p0___cluster_indices_replication_strategy___SEGMENT___/)

Retrying the gradle check

[jainankitk]

LGTM!