Remove ignore decorator for testCohereClassifyModel

[b4sjoo]

Description

Test several time on 2.x and 2.13 (the latest branch with this test), seems not flaky. Will add it back and see if we need a fix in the future.

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[mingshl]

failed tests on windows 21, rerunning

REPRODUCE WITH: gradlew ':opensearch-ml-plugin:integTest' --tests "org.opensearch.ml.tools.VisualizationsToolIT.testVisualizationFound" -Dtests.seed=D165A70B3F17347A -Dtests.security.manager=false -Dtests.locale=frr-DE -Dtests.timezone=Africa/Brazzaville -Druntime.java=21

VisualizationsToolIT > testVisualizationFound STANDARD_ERROR
    REPRODUCE WITH: gradlew ':opensearch-ml-plugin:integTest' --tests "org.opensearch.ml.tools.VisualizationsToolIT.testVisualizationFound" -Dtests.seed=D165A70B3F17347A -Dtests.security.manager=false -Dtests.locale=frr-DE -Dtests.timezone=Africa/Brazzaville -Druntime.java=21
    REPRODUCE WITH: gradlew ':opensearch-ml-plugin:integTest' --tests "org.opensearch.ml.tools.VisualizationsToolIT.testVisualizationFound" -Dtests.seed=D165A70B3F17347A -Dtests.security.manager=false -Dtests.locale=frr-DE -Dtests.timezone=Africa/Brazzaville -Druntime.java=21

VisualizationsToolIT > testVisualizationFound FAILED
    org.opensearch.client.ResponseException: method [POST], host [http://127.0.0.1:59057/], URI [/_plugins/_ml/agents/rZcBJpQB8FffSoUkgPJ7/_execute], status line [HTTP/1.1 500 Internal Server Error]
    {"status":500,"error":{"type":"AEADBadTagException","reason":"System Error","details":"Tag mismatch"}}
        at app//org.opensearch.client.RestClient.convertResponse(RestClient.java:501)
        at app//org.opensearch.client.RestClient.performRequest(RestClient.java:384)
        at app//org.opensearch.client.RestClient.performRequest(RestClient.java:359)
        at app//org.opensearch.ml.utils.TestHelper.makeRequest(TestHelper.java:182)
        at app//org.opensearch.ml.utils.TestHelper.makeRequest(TestHelper.java:155)