[Feature/agent_framework] Add Undeploy Model Step

[dbwiddis]

Description

Adds a workflow step to undeploy a model.

Issues Resolved

Part of #89

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[joshpalis]

Not related to this PR, but I've encountered this CI failure before and it seems like a flaky test, but I've never been able to reproduce it locally.

For encryption, we retrieve an instance of the JceMasterKey using the wrapping algorithm AES/GCM/NoPadding here, which this error indicates as the only correct wrapping algorithm to use.

Re-running the checks will always resolve this issue, but I'm unsure what the root cause of the failure is

REPRODUCE WITH: ./gradlew ':test' --tests "org.opensearch.flowframework.util.EncryptorUtilsTests.testEncryptDecryptTemplateCredential" -Dtests.seed=640FAD486BA2AFF -Dtests.security.manager=false -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=tr-TR -Dtests.timezone=Etc/UCT -Druntime.java=17
org.opensearch.flowframework.util.EncryptorUtilsTests > testEncryptDecryptTemplateCredential FAILED
    java.lang.IllegalArgumentException: Right now only AES/GCM/NoPadding is supported
        at __randomizedtesting.SeedInfo.seed([640FAD486BA2AFF:72B686C28E50824B]:0)
        at com.amazonaws.encryptionsdk.jce.JceMasterKey.getInstance(JceMasterKey.java:[66](https://github.com/opensearch-project/flow-framework/actions/runs/7065973095/job/19237007060?pr=236#step:7:67))
        at org.opensearch.flowframework.util.EncryptorUtils.encrypt(EncryptorUtils.java:185)
        at org.opensearch.flowframework.util.EncryptorUtils.lambda$processTemplateCredentials$0(EncryptorUtils.java:139)
        at java.base/java.util.HashMap.replaceAll(HashMap.java:1437)
        at org.opensearch.flowframework.util.EncryptorUtils.processTemplateCredentials(EncryptorUtils.java:139)
        at org.opensearch.flowframework.util.EncryptorUtils.encryptTemplateCredentials(EncryptorUtils.java:108)
        at org.opensearch.flowframework.util.EncryptorUtilsTests.testEncryptDecryptTemplateCredential(EncryptorUtilsTests.java:166)

[dbwiddis]

it seems like a flaky test, but I've never been able to reproduce it locally.

Turns out an uppercase i in Turkish is not I. Known common locale issue.