chore: remove abandoned package google/cloud-resource-settings

[bshaffer]

This package has been marked abandoned in our subrepo and in packagast

https://github.com/googleapis/google-cloud-php-resource-settings
https://packagist.org/packages/google/cloud-resource-settings

We can remove it from this repo to clean things up a little bit

BREAKING_CHANGE_REASON=this package is abandoned

[snippet-bot]

Here is the summary of changes.

You are about to delete 3 region tags.

• ResourceSettings/samples/V1/ResourceSettingsServiceClient/get_setting.php:25, tag resourcesettings_v1_generated_ResourceSettingsService_GetSetting_sync
• ResourceSettings/samples/V1/ResourceSettingsServiceClient/list_settings.php:25, tag resourcesettings_v1_generated_ResourceSettingsService_ListSettings_sync
• ResourceSettings/samples/V1/ResourceSettingsServiceClient/update_setting.php:25, tag resourcesettings_v1_generated_ResourceSettingsService_UpdateSetting_sync

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