Draft: Add UI for updating o11y settings records

What does this MR do and why?

This adds the UI for updating the o11y_service_settings records in the database.

References

UI for O11y settings

Database

Insert

INSERT INTO "observability_group_o11y_settings" ("group_id", "o11y_service_url", "o11y_service_user_email", "o11y_service_password", "o11y_service_post_message_encryption_key", "created_at", "updated_at")
    VALUES (22, 'http://localhost:8080/', 'ddux@gitlab.com', '{"p":"IqBul1jV34RfErM=","h":{"iv":"4iGVBgs2fkiXqWB2","at":"vqjHPWZ4DJ0N92eB6bFnSQ==","i":"Njc0OQ=="}}', '{"p":"+KPCxw7/wwyFthbIT2bdLSAy/z1hwIl+Wcjpki6bp4Sc6BFayVk9/bHuVqDsVnB8qKHHbV57","h":{"iv":"lNtHI0KsFKc+CzPB","at":"D3TH7IxsiqLKwrTII2DC6Q==","i":"Njc0OQ=="}}', '2025-07-17 20:22:59.405840', '2025-07-17 20:22:59.405840')
RETURNING
    "id";

Query plan: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/41630/commands/127795

Update

UPDATE
    "observability_group_o11y_settings"
SET
    "o11y_service_user_email" = 'ddux+updated@gitlab.com',
    "updated_at" = '2025-07-17 20:24:09.426583'
WHERE
    "observability_group_o11y_settings"."id" = 5;

Query plan: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/41630/commands/127797 There are no records for this table in the database yet. Since this is accessing by the primary key ID, it should be ok. Please let me know if I can do anything to provide more data for this.

Delete

DELETE FROM "observability_group_o11y_settings"
WHERE "observability_group_o11y_settings"."id" = 1

Query plan: https://console.postgres.ai/gitlab/gitlab-production-main/sessions/41630/commands/127796 There are no records for this table in the database yet. Since this is accessing by the primary key ID, it should be ok. Please let me know if I can do anything to provide more data for this.

Screenshots or screen recordings

Before	After

After the settings have been set, this page looks like this:

How to set up and validate locally

MR acceptance checklist

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