feat: [ShoppingMerchantInventories] Added the product_id_base64_url_encoded field to ListLocalInventoriesRequest, InsertLocalInventoryRequest, DeleteLocalInventoryRequest, ListRegionalInventoriesRequest, InsertRegionalInventoryRequest, and `DeleteRegionalInventoryReques... (#8726)

* feat: Added the `product_id_base64_url_encoded` field to `ListLocalInventoriesRequest`, `InsertLocalInventoryRequest`, `DeleteLocalInventoryRequest`, `ListRegionalInventoriesRequest`, `InsertRegionalInventoryRequest`, and `DeleteRegionalInventoryRequest`. This allows for product IDs containing special characters to be correctly handled when unpadded base64url-encoded

PiperOrigin-RevId: 830781196

Source-Link: googleapis/googleapis@5fa0268

Source-Link: googleapis/googleapis-gen@ef0ff8b
Copy-Tag: eyJwIjoiU2hvcHBpbmdNZXJjaGFudEludmVudG9yaWVzLy5Pd2xCb3QueWFtbCIsImgiOiJlZjBmZjhiYjRlYjExZTA4MDYzNzIxNjJlYjQxZjhkYTJiNDc0ZmIxIn0=

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* feat: Added the `product_id_base64_url_encoded` field to `ListLocalInventoriesRequest`, `InsertLocalInventoryRequest`, `DeleteLocalInventoryRequest`, `ListRegionalInventoriesRequest`, `InsertRegionalInventoryRequest`, and `DeleteRegionalInventoryRequest`. This allows for product IDs containing special characters to be correctly handled when base64url-encoded
feat: Added C#, PHP, and Ruby namespace options to LocalInventory and RegionalInventory proto files for improved client library generation
docs: Updated the API summary and overview in the service configuration

PiperOrigin-RevId: 830781339

Source-Link: googleapis/googleapis@3a8b8dd

Source-Link: googleapis/googleapis-gen@4237dde
Copy-Tag: eyJwIjoiU2hvcHBpbmdNZXJjaGFudEludmVudG9yaWVzLy5Pd2xCb3QueWFtbCIsImgiOiI0MjM3ZGRlZjcyYzU1NTcyM2YxNjM3MTU2YzgyYjVhOTkyODgxN2VkIn0=

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]