Add back the removed sms otp regex configuration

[shanggeeth]

Proposed changes in this pull request

With the following PRs, SMS OTP regex configuration has been replaced and OTP pattern configurations

1. Add feature to send OTPs in e-mail verifications.  #776
2. Add feature to send OTPs in e-mail verifications. wso2/carbon-identity-framework#5028

This was not backward compatible.

With changes from this PR, we do the following changes

1. The removed SMS OTP regex config is added back
2. Default values for new OTP pattern config is set as empty so that old sms otp regex pattern config will be prioritized.

The new otp pattern will be resolved in terms old sms otp regex pattern configuration with

• Resolve new OTP pattern configuration with old SMS OTP regex pattern configuration wso2/carbon-identity-framework#5278

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/7114145374

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/7114145374
Status: failure

[shanggeeth]

The test failure is expected

[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:329 1 expectation failed.
 JSON path find{ it.('connector-name') == 'self-sign-up' }.properties[3].value doesn't match.
 Expected: true
 Actual: 
 
 [INFO] Run 3: PASS
 [ERROR] Run 4: IdentityGovernanceSuccessTest.testSearchGovernanceConnectorProperties:329 1 expectation failed.
 JSON path find{ it.('connector-name') == 'self-sign-up' }.properties[3].value doesn't match.
 Expected: true
 Actual: 

Fix PR: wso2/product-is#18469