Add Julia as Shell type

[anthonykim1]

Adding Julia as Shell type.
Resolves: #224325

Will handle adding NuShell in separate PR
Will handle separating out pwsh, python, julia into GenericShellType Enum in separate PR.

[1chooo]

Look good to me!!!

[Tyriar]

FYI @davidanthoff, @pfitzseb

[pfitzseb]

Oh, great to see! Is the shell type set based on the executable name (i.e. shellPath)?

[Tyriar]

@pfitzseb yes, but not necessarily the path that's passed in. There's some logic that inspects the process tree of the terminal to find the inner shell path/process name:

vscode/src/vs/platform/terminal/node/terminalProcess.ts

Lines 407 to 416 in 559107b

	this._currentTitle = (ptyProcess.process ?? '');
	this._onDidChangeProperty.fire({ type: ProcessPropertyType.Title, value: this._currentTitle });
	// If fig is installed it may change the title of the process
	const sanitizedTitle = this.currentTitle.replace(/ \(figterm\)$/g, '');
	if (sanitizedTitle.toLowerCase().startsWith('python')) {
	this._onDidChangeProperty.fire({ type: ProcessPropertyType.ShellType, value: PosixShellType.Python });
	} else {
	this._onDidChangeProperty.fire({ type: ProcessPropertyType.ShellType, value: posixShellTypeMap.get(sanitizedTitle) });
	}

vscode/src/vs/platform/terminal/node/windowsShellHelper.ts

Lines 115 to 134 in 559107b

	async getShellName(): Promise<string> {
	if (this._store.isDisposed) {
	return Promise.resolve('');
	}
	// Prevent multiple requests at once, instead return current request
	if (this._currentRequest) {
	return this._currentRequest;
	}
	if (!windowsProcessTree) {
	windowsProcessTree = await import('@vscode/windows-process-tree');
	}
	this._currentRequest = new Promise<string>(resolve => {
	windowsProcessTree.getProcessTree(this._rootProcessId, tree => {
	const name = this.traverseTree(tree);
	this._currentRequest = undefined;
	resolve(name);
	});
	});
	return this._currentRequest;
	}

The idea being, if you launch bash inside pwsh, it should correctly get changed to bash.