Python function app: Attribute error context object has no attribute retry_context

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#### Investigative information

Please provide the following:

- Timestamp: 2022-03-08 05:13:40.815
- Function App version: ~4
- Function App name: notifications-hw
- Function name(s) (as appropriate): TestRetryHttpTrigger
- Invocation ID: d84ec5ac-6e18-41fe-9f02-8baf70a9d675
- Region: East US

#### Repro steps

Provide the steps required to reproduce the problem:

1. Add the function level retry policy in function.json file as shown in the following doc - https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-error-pages?tabs=python#fixed-delay-retry.
2. Below is my function.json
{
"scriptFile": "__init__.py",
"bindings": [
{
"authLevel": "function",
"type": "httpTrigger",
"direction": "in",
"name": "req",
"methods": [
"get",
"post"
]
},
{
"type": "http",
"direction": "out",
"name": "$return"
}
],
"retry": {
"strategy": "fixedDelay",
"maxRetryCount": 4,
"delayInterval": "00:00:10"
}
}

4. Add the below line in the begining of your function to log number of retries.
logging.log(f'Current retry count: {context.retry_context.retry_count}')

#### Expected behavior

Provide a description of the expected behavior.

- Function runs 3 times as defined in the retry policy.
- Function should have logged the number of retires info.
-

#### Actual behavior

Provide a description of the actual behavior observed.

- Function runs 3 times as expected but throw Attribute error context object has no attribute retry_context. while logging the number of retries.

#### Known workarounds

Provide a description of any known workarounds.

#### Related information

Provide any related information

* Programming language used - Python
* Links to source - Sames as given on the following link https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-error-pages?tabs=python#fixed-delay-retry
* Bindings used - http

Start with the reported function.json retry configuration and the Python function named TestRetryHttpTrigger, then review the linked Azure Functions retry documentation and reproduce the AttributeError around context.retry_context. Trace how the Python context is created for the HTTP trigger and verify that retry information is available when the function logs the retry count.

Written by the indexing model from the issue text.