Unifying keystore related functionalities into one place

[hwupathum]

$subject

Related to https://github.com/wso2/product-is/issues/21359

[hwupathum]

Tested following flows

Primary tenant

• [x] View primary keystore
• [x] Add JKS keystore
• [x] Add cert to keystore
• [x] View added keystore
• [x] Delete added keystore

Other tenant

• [x] View tenanted keystore
• [x] Add JKS keystore
• [x] Add cert to keystore
• [x] View added keystore
• [x] Delete added keystore

[jenkins-is-staging]

PR builder started Link: https://github.com/wso2/product-is/actions/runs/11360027524

[jenkins-is-staging]

PR builder completed Link: https://github.com/wso2/product-is/actions/runs/11360027524 Status: failure