refactor: Removes samples after migration to nodejs-docs-samples

[ahrarmonsur]

Cleans up source repo after migration, tracked by b/257074857.

• Sample have landed in nodejs-docs-samples/monitoring by samples: migrate code from googleapis/nodejs-monitoring GoogleCloudPlatform/nodejs-docs-samples#2807

• CL for updating the documentation: cl/488938581

[conventional-commit-lint-gcf]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot
https://conventionalcommits.org/

[snippet-bot]

Here is the summary of changes.

You are about to delete 28 region tags.

• samples/alerts.backupPolicies.js:18, tag monitoring_alert_backup_policies
• samples/alerts.deleteChannels.js:18, tag monitoring_alert_delete_channel
• samples/alerts.deleteChannels.js:19, tag monitoring_alert_list_channels
• samples/alerts.enablePolicies.js:20, tag monitoring_alert_enable_policies
• samples/alerts.listPolicies.js:18, tag monitoring_alert_list_policies
• samples/alerts.replaceChannels.js:18, tag monitoring_alert_replace_channels
• samples/alerts.replaceChannels.js:19, tag monitoring_alert_enable_channel
• samples/alerts.replaceChannels.js:20, tag monitoring_alert_update_channel
• samples/alerts.replaceChannels.js:21, tag monitoring_alert_create_channel
• samples/alerts.restorePolicies.js:18, tag monitoring_alert_restore_policies
• samples/alerts.restorePolicies.js:19, tag monitoring_alert_create_policy
• samples/metrics.createDescriptor.js:23, tag monitoring_create_metric
• samples/metrics.deleteDescriptor.js:23, tag monitoring_delete_metric
• samples/metrics.getDescriptor.js:23, tag monitoring_get_descriptor
• samples/metrics.getMonitoredResourceDescriptor.js:22, tag monitoring_get_resource
• samples/metrics.listDescriptors.js:22, tag monitoring_list_descriptors
• samples/metrics.listMonitoredResourceDescriptors.js:22, tag monitoring_list_resources
• samples/metrics.readTimeSeriesAggregate.js:23, tag monitoring_read_timeseries_align
• samples/metrics.readTimeSeriesData.js:23, tag monitoring_read_timeseries_simple
• samples/metrics.readTimeSeriesFields.js:23, tag monitoring_read_timeseries_fields
• samples/metrics.readTimeSeriesReduce.js:23, tag monitoring_read_timeseries_reduce
• samples/metrics.writeTimeSeriesData.js:23, tag monitoring_write_timeseries
• samples/uptime.js:26, tag monitoring_uptime_check_create
• samples/uptime.js:88, tag monitoring_uptime_check_list_configs
• samples/uptime.js:130, tag monitoring_uptime_check_list_ips
• samples/uptime.js:151, tag monitoring_uptime_check_get
• samples/uptime.js:194, tag monitoring_uptime_check_delete
• samples/uptime.js:227, tag monitoring_uptime_check_update

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[ahrarmonsur]

@sofisl the CL mentioned in the description to update the documentation has been merged. That should address the region tags flagged by snippet-bot.