[release/8.0] Fix app_offline detection for some OSes

[github-actions]

Backport of #52780 to release/8.0

/cc @BrennanConroy

Fix app_offline detection for some OSes

Description

On some OSes (Windows Server 2012 R2), shutting down an IIS hosted app hangs forever due to this regression. Fortunately when we made the change we put in a fallback via an environment variable so folks can be unblocked. But we should revert the part that caused the hangs.

Fixes the issues listed below.

Customer Impact

Customer issues #52307 and #52539, and possibly #52525

Regression?

• Yes
• No

Regressed from 7.0.

Risk

• High
• Medium
• Low

Just reverting part of the regression change to what it was before in 7.0.

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

[ghost]

Hi @github-actions[bot]. If this is not a tell-mode PR, please make sure to follow the instructions laid out in the servicing process document.
Otherwise, please add tell-mode label.

[ghost]

Hi @github-actions[bot]. Please make sure you've updated the PR description to use the Shiproom Template. Also, make sure this PR is not marked as a draft and is ready-to-merge.

To learn more about how to prepare a servicing PR click here.

[ghost]

Hi @github-actions[bot]. This PR was just approved to be included in the upcoming servicing release. Somebody from the @dotnet/aspnet-build team will get it merged when the branches are open. Until then, please make sure all the CI checks pass and the PR is reviewed.

[adityamandaleeka]

Approved over email.

[ghost]

Looks like this PR hasn't been active for some time and the codebase could have been changed in the meantime.
To make sure no conflicting changes have occurred, please rerun validation before merging. You can do this by leaving an /azp run comment here (requires commit rights), or by simply closing and reopening.

[wtgodbe]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).