Reland "macOS Signing Scripts: Default to using notarytool for notari…

…zation."

This is a reland of commit 741ed96

Work has been done internally to enable re-landing this. This CL
can still be safely reverted if it causes breakage.

Original change's description:
> macOS Signing Scripts: Default to using notarytool for notarization.
>
> This will switch official builds to use notarytool rather than altool.
> The CL can be safely reverted if any unexpected errors are encountered.
>
> Bug: 1217659
> Change-Id: If6ba33a93b135bb9ae9b1b04444380c8da900e5d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3557773
> Reviewed-by: Mark Mentovai <[email protected]>
> Commit-Queue: Robert Sesek <[email protected]>
> Cr-Commit-Position: refs/heads/main@{#986708}

Bug: 1217659
Change-Id: Ica60e04c0c0eb1ca645a0a8fd7341d46490e25bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4476227
Reviewed-by: Mark Mentovai <[email protected]>
Commit-Queue: Robert Sesek <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1135543}

chrome/installer/mac/signing/config.py

@@ -142,7 +142,7 @@ def notarization_tool(self):
         notary service. The values are from the signing.model.NotarizationTool
         enum.
         """
-        return self._notarization_tool or NotarizationTool.ALTOOL
+        return self._notarization_tool or NotarizationTool.NOTARYTOOL
 
     @property
     def notarization_tool_path(self):