Azure Search: Firewall bypass option not supported via Azure CLI

## Problem
Attempting to set the firewall bypass option (`network_rule_set.bypass`) for an Azure Cognitive Search service using the Azure CLI is not supported and results in an error. The CLI only exposes `ip_rules` in `network_rule_set`, while the Azure REST API and ARM templates support a `bypass` property. This creates inconsistency and limits automation via CLI.

## Steps to Reproduce
1. Run the following command:
```sh
az search service update \
--name \
--resource-group \
--set network_rule_set.bypass="AzureServices"
```
2. Observe the error: `Couldn't find 'bypass' in 'network_rule_set'. Available options: ['ip_rules']`

## Expected Behavior
It should be possible to set the `bypass` property using the Azure CLI in line with the Azure REST API and ARM template schema.

## Actual Behavior
The CLI does not support the `bypass` property and raises an error.

## Impact
- Automation scripts using the CLI cannot enable/disable firewall bypass for Azure Cognitive Search.
- Users must use ARM templates or direct REST API calls, which are less convenient for scripting and operational consistency.

## References
- [Azure REST API networkRuleSet docs](https://learn.microsoft.com/en-us/rest/api/searchservice/update-service?tabs=HTTP)
- [CLI error message reference]

## Suggested Solution
Enhance the Azure CLI to support the `bypass` property in `network_rule_set` for Azure Cognitive Search services.