Introduce config to disable account activation confirmation email notification

[Kanapriya]

Resolves : wso2/product-is#15336
Internal JIRA - https://github.com/wso2-enterprise/wso2-iam-internal/issues/272
Create this git issue to track the improvement to decouple the notification based on the configurations under the respective scenario in the upcoming releases - wso2/product-is#15413

Proposed changes in this pull request

Introduced tenant-wise config and global config to disable the account activation email notification.
By default, the account activation notification will be enabled to maintain backward compatibility.

• Introduced a global config in deployment.toml file as follows to disable the notification. Hence this will be useful when there is a multi-tenancy environment and wanted to disable the notification for all tenants.

[identity_mgt.user_onboarding]
ask_password_account_activation = false

• If it is required to disable the notification tenant-wise, then login to the tenant and disable the “Send account activation email” property under the Identity Providers -> Resident -> User Onboarding -> Ask Password section.

When should this PR be merged

[Please describe any preconditions that need to be addressed before we
can merge this pull request.]

Follow up actions

The document should be updated accordingly - wso2/docs-is#3634

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[Kanapriya]

Only the following test case failed due to the newly introduced governance properties.

INFO  [org.wso2.carbon.automation.extensions.servers.carbonserver.CarbonServerManager] - Jacoco coverage dump file path : /home/runner/work/product-is/product-is/product-is/modules/integration/tests-integration/tests-backend/target/jacoco/jacoco1694334449496.exec
INFO  [org.wso2.carbon.automation.extensions.servers.carbonserver.CarbonServerManager] - Jacoco class file path : /home/runner/work/product-is/product-is/product-is/modules/integration/tests-integration/tests-backend/target/carbontmp1694328702709/wso2is-7.0.0-m2-SNAPSHOT/repository/components/plugins
INFO  [org.wso2.carbon.automation.extensions.servers.carbonserver.CarbonServerManager] - Jacoco coverage HTML report path : /home/runner/work/product-is/product-is/product-is/modules/integration/tests-integration/tests-backend/target/jacoco/coverage/index.html
[ERROR] Tests run: 2009, Failures: 2, Errors: 0, Skipped: 0, Time elapsed: 5,749.493 s <<< FAILURE! - in TestSuite
[ERROR] testSearchGovernanceConnectorProperties(org.wso2.identity.integration.test.rest.api.server.identity.governance.v1.IdentityGovernanceSuccessTest)  Time elapsed: 1.055 s  <<< FAILURE!
java.lang.AssertionError: 
1 expectation failed.
JSON path find{ it.('connector-name') == 'user-email-verification' }.properties[3].name doesn't match.
Expected: EmailVerification.ExpiryTime
  Actual: EmailVerification.AskPassword.AccountActivation

	at org.wso2.identity.integration.test.rest.api.server.identity.governance.v1.IdentityGovernanceSuccessTest.testSearchGovernanceConnectorProperties(IdentityGovernanceSuccessTest.java:328)

[ERROR] testSearchGovernanceConnectorProperties(org.wso2.identity.integration.test.rest.api.server.identity.governance.v1.IdentityGovernanceSuccessTest)  Time elapsed: 0.905 s  <<< FAILURE!
java.lang.AssertionError: 
1 expectation failed.
JSON path find{ it.('connector-name') == 'user-email-verification' }.properties[3].name doesn't match.
Expected: EmailVerification.ExpiryTime
  Actual: EmailVerification.AskPassword.AccountActivation

	at org.wso2.identity.integration.test.rest.api.server.identity.governance.v1.IdentityGovernanceSuccessTest.testSearchGovernanceConnectorProperties(IdentityGovernanceSuccessTest.java:328)

[INFO] 
[INFO] Results:
[INFO] 
[ERROR] Failures: 
[ERROR] org.wso2.identity.integration.test.rest.api.server.identity.governance.v1.IdentityGovernanceSuccessTest.testSearchGovernanceConnectorProperties(org.wso2.identity.integration.test.rest.api.server.identity.governance.v1.IdentityGovernanceSuccessTest)
[INFO]   Run 1: PASS
[ERROR]   Run 2: IdentityGovernanceSuccessTest.testSearchGovernanceConnectorProperties:328 1 expectation failed.
JSON path find{ it.('connector-name') == 'user-email-verification' }.properties[3].name doesn't match.
Expected: EmailVerification.ExpiryTime
  Actual: EmailVerification.AskPassword.AccountActivation

[INFO]   Run 3: PASS
[ERROR]   Run 4: IdentityGovernanceSuccessTest.testSearchGovernanceConnectorProperties:328 1 expectation failed.
JSON path find{ it.('connector-name') == 'user-email-verification' }.properties[3].name doesn't match.
Expected: EmailVerification.ExpiryTime
  Actual: EmailVerification.AskPassword.AccountActivation

The above test failure can be fixed with the following PR
https://github.com/wso2/product-is/pull/16614/files