Add a Program.Main() override with a throwOnError parameter

[0xced]

Ensuring that playwright is properly installed can be done by running the following code:

var playwright = new Microsoft.Playwright.Program();
var exitCode = playwright.Run(["install", "--with-deps"]);

This is fine when the installation succeeds and the exit code is 0. But when running under xUnit.net (which does not capture the console output) and the installation fails with exit code 1, then it becomes impossibly hard to diagnose the root cause of the failure.

For example, a failure can be triggered by deleting the installed browers in the ms-playwright cache directory and setting the https_proxy environment variable to an invalid proxy: http://127.0.0.1:33333.

Under these conditions, running with the new throwOnError parameter becomes diagnosable.

var playwright = new Microsoft.Playwright.Program();
var exitCode = playwright.Run(["install", "--with-deps", "firefox"], throwOnError: true);

This throws a PlaywrightException with the exact command executed and its output, making it clear what the problem is.

Failed to run playwright-dotnet/src/playwright-xunit/bin/Debug/net8.0/.playwright/node/darwin-x64/node "playwright-dotnet/src/playwright-xunit/bin/Debug/net8.0/.playwright/package/cli.js" "install" "--with-deps" "firefox"
Downloading Firefox 132.0 (playwright build v1466) from https://playwright.azureedge.net/builds/firefox/1466/firefox-mac.zip
Error: connect ECONNREFUSED 127.0.0.1:33333
at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1610:16) {
errno: -61,
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 33333
}
Downloading Firefox 132.0 (playwright build v1466) from https://playwright-akamai.azureedge.net/builds/firefox/1466/firefox-mac.zip
Error: connect ECONNREFUSED 127.0.0.1:33333
at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1610:16) {
errno: -61,
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 33333
}
Downloading Firefox 132.0 (playwright build v1466) from https://playwright-verizon.azureedge.net/builds/firefox/1466/firefox-mac.zip
Error: connect ECONNREFUSED 127.0.0.1:33333
at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1610:16) {
errno: -61,
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 33333
}
Failed to install browsers
Error: Failed to download Firefox 132.0 (playwright build v1466), caused by
Error: Download failure, code=1

Fixes #3139