[core-rest-pipeline] Remove oscpu from OS sniffing

[mpodwysocki]

Packages impacted by this PR

• [@azure/core-rest-pipeline]

Issues associated with this PR

#24758

Describe the problem that is addressed by this PR

Relies on the deprecated oscpu. This uses the non-standard globalThis.navigator.userAgentData.platform and falls back to the deprecated globalThis.navigator.platform.

What are the possible designs available to address the problem? If there are more than one possible design, why was the one in this PR chosen?

We could have removed the OS checks overall, but we can get better telemetry to keep the OS detection.

Are there test cases added in this PR? (If not, why?)

Provide a list of related PRs (if any)

Command used to generate this PR:**(Applicable only to SDK release request PRs)

Checklists

• Added impacted package name to the issue description
• Does this PR needs any fixes in the SDK Generator?** (If so, create an Issue in the Autorest/typescript repository and link it here)
• Added a changelog (if necessary)

[azure-sdk]

API change check

API changes are not detected in this pull request.

[xirzec]

Could you post an example UA before/after this change from Chrome, Edge, and Firefox?

[witemple-msft]

This may change the formatting of some platform specific strings (like UA we send), but they'll contain the same basic info.

[jeremymeng]

Looks good!

[mpodwysocki]

@xirzec Note that this change will affect Blink-Based browsers with Chrome/Edge/Opera. Note that Safari and Firefox do not implement the navigator.userAgentData.platform API, so the results will not change.

Before with navigator.platform

• Windows - win32
• macOS - macIntel
• Linux - linux (architecture)

After using Blink Based Browsers (Chrome/Edge/Opera/etc) with navigator.userAgentData.platform

• Windows - windows
• macOS - macOS
• Linux - linux