#1529 Avoid using reportResult if installing lib/core

[kittaakos]

Motivation

To fix the persistent error (see #1529) when installing a library or platform. As part of the arduino/arduino-cli#1875 the DownloadProgress(Start|Update|End) APIs have been unified. Besides the index updates, the lib/platform install started to use the same API as the index update, but IDE2 was not prepared for this. The PR should fix the bug by avoiding calling non-existing IDE2 code when installing a lib/platform. For the index updates, everything remains the same in IDE2.

Change description

Other information

To verify:

• Start IDE2 from a terminal or open DevTools in the browser window,
• Install a couple of libraries and platforms. It should work. It fails from the main (61a11a0)

Closes #1529

Reviewer checklist

• PR addresses a single concern.
• The PR has no duplicates (please search among the Pull Requests before creating one)
• PR title and description are properly filled.
• Docs have been added / updated (for bug fixes / features)