Rm long-term connection support

[littleEast7]

To avoid exhausting worker connections, long-lived connection support was removed on the client side.

[Copilot]

Pull request overview

This PR removes long-lived connection support from the Alluxio client to prevent exhausting worker connections. The changes eliminate session-based HTTP requests in favor of direct requests.get() calls, and remove the associated concurrency configuration parameter.

Key changes:

• Removed session creation and management from AlluxioClient class
• Replaced all self.session.get() calls with direct requests.get() calls
• Removed concurrency parameter from configuration

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
config_template.yaml	Removed concurrency configuration documentation and default value
alluxiofs/client/config.py	Removed concurrency parameter, validation, and instance variable from AlluxioClientConfig
alluxiofs/client/core.py	Removed session initialization in AlluxioClient and replaced session-based HTTP calls with direct requests library calls

Comments suppressed due to low confidence (1)

alluxiofs/client/core.py:2240

• The requests.request() function is being used incorrectly in an async context. The requests library is synchronous and does not support async/await or context managers. This line should use self.session.request() instead, where self.session is the aiohttp.ClientSession instance created in _set_session(). This will cause a runtime error when this async method is called.

        async with requests.request(
            method=method.value,
            url=url,
            params=params,
            json=json,
            headers=headers,
            data=data,
            timeout=None,
        ) as r:

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