add allowNTLMCredentialsForDomains option to enterprise config file

[sliezz]

This PR add an ability to system administrators of configuring NTLM Credentials for domains without recompiling Zulip Desktop сlient app.

There is an Electron demand to implicity configure a list of servers for which integrated authentication is enabled.
Electon docs

In fact It useful only in an Enterprise environments I think we should configure it in appropriate config file

Fixes:

• add option allowNTLMCredentialsForDomains to "Zulip-Desktop-Config/global_config.json"
• on app init it checks up server list and send it to Electron

Platforms this PR was tested on:

• Windows
• macOS
• Linux (Ubuntu)

Self-review checklist

• Self-reviewed the changes for clarity and maintainability
  (variable names, code reuse, readability, etc.).

Communicate decisions, questions, and potential concerns.

• Explains differences from previous plans (e.g., issue description).
• Highlights technical choices and bugs encountered.
• Calls out remaining decisions and concerns.
• Automated tests verify logic where appropriate.

Individual commits are ready for review (see commit discipline).

• Each commit is a coherent idea.
• Commit message(s) explain reasoning and motivation for changes.

Completed manual review and testing of the following:

• Visual appearance of the changes.
• Responsiveness and internationalization.
• Strings and tooltips.
• End-to-end functionality of buttons, interactions and flows.
• Corner cases, error conditions, and easily imagined bugs.