Disable WAF for NLB and only deploy infraStack

[gaiksaya]

Description

As per WAF documentation, only following formats are supported

     * - For an Application Load Balancer: `arn:aws:elasticloadbalancing: *region* : *account-id* :loadbalancer/app/ *load-balancer-name* / *load-balancer-id*`
     * - For an Amazon API Gateway REST API: `arn:aws:apigateway: *region* ::/restapis/ *api-id* /stages/ *stage-name*`
     * - For an AWS AppSync GraphQL API: `arn:aws:appsync: *region* : *account-id* :apis/ *GraphQLApiId*`

Since this clusters use NLB need to come up with another solution

• Also only deploys infraStack using workflow. Since 2x and 3x runs simultaneously, the cloudformation status check fails the stack update saying CREATE_IN_PROGRESS state and can not be updated See https://github.com/opensearch-project/opensearch-devops/actions/runs/8902202666/job/24447695425
• Also makes the job to add alerts optional as notification and alerting plugin may or may not be the part of the deploying distribution

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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