Stop throwing errors when a user deletes an integrated Google calendar

[sergiojoker11]

Reproduction steps:

• active user selects one of their calendars so we send reminders for.
• user deletes the calendar.

Then: find-actionable-events fails with 404 on every single background processing cycle when we invoke GET events for calendar as calendar no longer exists.

Google response when this happens:

{
    "name": "Error",
    "location": "/node_modules/gaxios/src/gaxios.ts:211",
    "message": "Not Found",
    "stack": "Error: Not Found\n    at WD._request (/node_modules/gaxios/src/gaxios.ts:211:15)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async r.requestAsync (/node_modules/google-auth-library/build/src/auth/oauth2client.js:463:20)\n    at async v2e (/node_modules/googleapis-common/build/src/apirequest.js:308:25)\n    at async ES (/src/services/observability/metrics.ts:25:20)\n    at async Uv.processRecord (/node_modules/@aws-lambda-powertools/batch/lib/esm/BatchProcessor.js:171:28)\n    at async Promise.all (index 0)\n    at async Uv.process (/node_modules/@aws-lambda-powertools/batch/lib/esm/BasePartialProcessor.js:75:15)\n    at async fJ (/node_modules/@aws-lambda-powertools/batch/lib/esm/processPartialResponse.js:73:5)\n    at async o0e (/node_modules/@middy/core/index.js:215:23)",
    "cause": {
        "message": "Not Found",
        "code": 404,
        "status": "Not Found",
        "errors": [
            {
                "domain": "global",
                "reason": "notFound",
                "message": "Not Found"
            }
        ]
    },
    "config": {
        "url": "https://www.googleapis.com/calendar/v3/calendars/b522f10b11034db056d97087b918ec004c98c553c26b958f6200fbaedd806a87%40group.calendar.google.com/events?timeMax=2025-10-03T18%3A29%3A59.999Z&timeMin=2025-10-03T18%3A00%3A00.000Z&timeZone=UTC",
        "method": "GET",
        "apiVersion": "",
        "userAgentDirectives": [
            {
                "product": "google-api-nodejs-client",
                "version": "8.0.0",
                "comment": "gzip"
            }
        ],
        "headers": {},
        "params": {
            "timeMax": "2025-10-03T18:29:59.999Z",
            "timeMin": "2025-10-03T18:00:00.000Z",
            "timeZone": "UTC"
        },
        "retry": true,
        "responseType": "unknown",
        "retryConfig": {
            "currentRetryAttempt": 0,
            "retry": 3,
            "httpMethodsToRetry": [
                "GET",
                "HEAD",
                "PUT",
                "OPTIONS",
                "DELETE"
            ],
            "noResponseRetries": 2,
            "retryDelayMultiplier": 2,
            "timeOfFirstRequest": 1759428056398,
            "totalTimeout": 9007199254740991,
            "maxRetryDelay": 9007199254740991,
            "statusCodesToRetry": [
                [
                    100,
                    199
                ],
                [
                    408,
                    408
                ],
                [
                    429,
                    429
                ],
                [
                    500,
                    599
                ]
            ]
        }
    },
    "response": {
        "size": 0,
        "data": {
            "error": {
                "code": 404,
                "message": "Not Found"
            }
        },
        "config": {
            "url": "https://www.googleapis.com/calendar/v3/calendars/b522f10b11034db056d97087b918ec004c98c553c26b958f6200fbaedd806a87%40group.calendar.google.com/events?timeMax=2025-10-03T18%3A29%3A59.999Z&timeMin=2025-10-03T18%3A00%3A00.000Z&timeZone=UTC",
            "method": "GET",
            "apiVersion": "",
            "userAgentDirectives": [
                {
                    "product": "google-api-nodejs-client",
                    "version": "8.0.0",
                    "comment": "gzip"
                }
            ],
            "params": {
                "timeMax": "2025-10-03T18:29:59.999Z",
                "timeMin": "2025-10-03T18:00:00.000Z",
                "timeZone": "UTC"
            },
            "retry": true,
            "responseType": "unknown"
        }
    },
    "code": 404,
    "status": 404
}