feat: Add UI regex validation

[Aditya-ranjan-16]

Description

Add regex validation in ibm_catalog.json

Git_issue:https://github.ibm.com/GoldenEye/issues/issues/16144

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Release notes content

Add regex validation in ibm_catalog.json

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[Aditya-ranjan-16]

/run pipeline

[ocofaigh]

/run pipeline

[ocofaigh]

@Aditya-ranjan-16 Please check:

         2025/11/21 09:28:42 Terraform plan | Error: Invalid value for variable
         2025/11/21 09:28:42 Terraform plan | 
         2025/11/21 09:28:42 Terraform plan |   on schematics.tfvars line 6:
         2025/11/21 09:28:42 Terraform plan |    6: service_crn = "crn:v1:bluemix:public:service:global:::endpoint:test.private.example.com"
         2025/11/21 09:28:42 Terraform plan |     ├────────────────
         2025/11/21 09:28:42 Terraform plan |     │ var.service_crn is "crn:v1:bluemix:public:service:global:::endpoint:test.private.example.com"