feat: add semgrep.appUrl setting to configure SEMGREP_APP_URL for LSP daemon

[liukatkat]

Summary

• Adds a new semgrep.appUrl VS Code setting (string, default empty) for configuring the Semgrep App URL
• Passes the value as SEMGREP_APP_URL in the environment of the spawned LSP daemon process
• No-op when left empty (default behavior unchanged)

Why:

People who are on a separate tenant has been having trouble logging in to the IDE extension. I suspect that it is because there is no way to configure the SEMGREP_APP_URL for the LSP daemon that we spawn in the IDE extension.

Test plan

• Set semgrep.appUrl to a custom URL in VS Code settings, restart the extension, and verify the LSP daemon receives SEMGREP_APP_URL in its environment
• Leave semgrep.appUrl empty and verify no SEMGREP_APP_URL is set (existing behavior unchanged)
• Login to a tenant and check that the extension works

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