[No QA] Update TriNet and Gusto help site docs for HR page

[MelvinBot]

Explanation of Change

Updates the help site documentation to reflect the new TriNet HR integration in New Expensify:

• TriNet article: Rewrites navigation paths to reference the HR page instead of the old Settings > Workspaces > Accounting path. Documents that approval mode and final approver are configured on the TriNet card on the HR page, and that the Workflows page shows resulting approval chains but links back to HR for config changes. Updates keywords from "Expensify Classic" to "New Expensify".
• New Gusto article (new-expensify/connections/Gusto.md): Creates a New Expensify version of the Gusto article (previously only existed for Expensify Classic). Mirrors the TriNet article structure — HR page card, approval config, Workflows page relationship.
• Workspace-Workflows article: Adds a callout under Approvals noting that HR-integrated workspaces (Gusto, TriNet) manage approval configuration from the HR page.

Fixed Issues

$ https://github.com/Expensify/Expensify/issues/632396

Tests

// TODO: The human co-author must fill out the tests you ran before marking this PR as "ready for review"
// Please describe what tests you performed that validates your changed worked.

Offline tests

N/A — documentation-only changes.

QA Steps

// TODO: The human co-author must fill out the QA tests you ran before marking this PR as "ready for review".
// Please describe what QA needs to do to validate your changes and what areas do they need to test for regressions.

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
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Screenshots/Videos

Android: Native

N/A — documentation-only changes.

Android: mWeb Chrome

N/A — documentation-only changes.

iOS: Native

N/A — documentation-only changes.

iOS: mWeb Safari

N/A — documentation-only changes.

MacOS: Chrome / Safari

N/A — documentation-only changes.

[OSBotify]

A preview of your ExpensifyHelp changes have been deployed to https://eb1cc1a3.helpdot.pages.dev ⚡️

Updated articles:

• articles/new-expensify/connections/Gusto
• articles/new-expensify/connections/TriNet
• articles/new-expensify/workspaces/Workspace-Workflows