[Agent CI] Improve release pipeline stability

[alexander-smolyakov]

Issue description:
Recently we faced two issues with the release pipeline:

First issue:

The Sign Agent Assemblies (3rd Party Assemblies Signing) step could take up to 40 minutes this could cause cancel of the pipeline job due to a hit of time limitation. Current value for timeoutInMinutes is set to 60 minutes.

Second issue:

The Delete CodeSignSummary.md step could failed due to the following error:

##[error]Error: Failed rmRF: EPERM: operation not permitted, unlink 'D:\a\1\s\_layout\win-x64\CodeSignSummary-RandomGUID.md'

The issue itself seems to be intermittent since and related to the environment.

Fix description:
To fix the first issue we can increase timeoutInMinutes to make sure that the pipeline job would not be canceled by ADO after 60 minutes. For the second issue, we can set retryCountOnTaskFailure so ADO will retry the Delete CodeSignSummary.md step several times before failing the pipeline job.

Changelog:

• build-jobs.yml: Increase default value for timeoutInMinutes from 60 to 120 minutes
• signing.yml: Set retryCountOnTaskFailure to 4 for Delete CodeSignSummary.md pipeline step