Bug with webhook registration for `customer.tags_added` and `customer.tags_removed` topics

ShopifyApp::WebhooksManager.add_registrations does not work for those topics.

The topic contain . which is not handled correctly by the ShopifyAPI::Webhooks::Registration. On line 31 '/' is replaced with '_', while '.' is not replaced.

In the ShopifyAPI::Webhooks::Registry service on line 163 both '/' and '.' are replaced.

Expected behavior

Find the webhooks registered on an installed store

Actual behavior

The webhooks are missing with a silent fail

Steps to reproduce the problem

1. Add the topics to your required webhooks.
2. Install a store
3. Check added webhooks

Debug logs

When running the registration for those 2 topics one gets an error in the grapqhl call

  "message" => "syntax error, unexpected invalid token (\".\") at [2, 55]",

This is the current graphql mutation, and as one can see the topic is CUSTOMER.TAGS_ADDED instead of CUSTOMER_TAGS_ADDED

"mutation webhookSubscription {\n  eventBridgeWebhookSubscriptionCreate(topic: CUSTOMER.TAGS_ADDED, webhookSubscription: {arn: \"arn:aws:events:us-east-1::event-source/aws.partner/shopify.com/3358559/frcpOctavian\"}) {\n    userErrors {\n      field\n      message\n    }\n    webhookSubscription {\n      id\n    }\n  }\n}\n"

Start by comparing ShopifyAPI::Webhooks::Registration with the normalization already used in ShopifyAPI::Webhooks::Registry, focusing on how webhook topics are converted before the GraphQL mutation. Reproduce registration for customer.tags_added and customer.tags_removed; done means the mutation uses CUSTOMER_TAGS_ADDED and CUSTOMER_TAGS_REMOVED and the webhooks are found on the installed store.