{Core} Disable aladdin recommendation in autocomplete mode

[bebound]

Description

If the command is not complete, you will get recommendation.
For example, run az account you get

the following arguments are required: _subcommand

Examples from AI knowledge base:
az account list
Get a list of subscriptions for the logged in account. (autogenerated)

az account show
Get the details of a subscription. (autogenerated)

az account set --subscription mysubscription
Set a subscription to be the current active subscription. (autogenerated)

https://docs.microsoft.com/en-US/cli/azure/account#az_account_list
Read more about the command in reference docs

In autocomplete mode, it's common that the command is not complete. The recommendation is useless and time-consuming.
So I disable it in autocomplete mode.

Testing Guide

time IFS=$'\013' _ARC_DEBUG=1 COMP_LINE='az account' COMP_POINT=11 COMP_TYPE="" _ARGCOMPLETE=1 _ARGCOMPLETE_SUPPRESS_SPACE=0 az 8>&1 1>&1 2>&1 9>&1 takes 0.4s.
After applying this PR, it only takes 0.2s.

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[yonzhan]

Core

[jiasli]

I think we already have similar logic:

azure-cli/src/azure-cli-core/azure/cli/core/__init__.py

Line 74 in 5c57d1c

self.data['completer_active'] = ARGCOMPLETE_ENV_NAME in os.environ

[jiasli]

This can be retrieved from self.cli_ctx.data['completer_active'].

[bebound]

Nice catch, I'll update #24765 too.