Improve name and description of File Downloader Algorithm and fix failing SKIP OUTPUT (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#58464
Author: @signedav
QGIS version: 3.40

Improve name and description of File Downloader Algorithm and fix failing SKIP OUTPUT

PR Description:

• Changed name to "Download file (HTTP request)" because it's not given that a file download is performed by HTTP, and this is what this algorithm is about. Even more one easily can use it to perform HTTP requests without caring about the file.
• Still the algorithm failed because of SKIP OUTPUT not passing a file path to the QgsFileDownloader why I set the parameter to mandatory instead
• Additionally I added some tags

One could think about other improvements (but not part of this PR):

• Allow not to download files and only perform requests
• Put responses and / or status code (even on error) to the output

Commits tagged with [need-docs] or [FEATURE]

[signedav]

The new name is "Download File via HTTP(S)"

See qgis/QGIS#58464 (comment)