fix: use default polling freq

[mshanemc]

the freq is set in the plugin now, so this PR isn't required to close the gh issue. This change is to prevent other library consumers from hitting the same bug the plugin was.

What does this PR do?

plugin library passes around the PackageInstallOptions. If you pass any options, it eventually gets to here

packaging/src/package/packageInstall.ts

Line 199 in b7c470d

const { pollingFrequency, pollingTimeout } = options;

where an undefined frequency will become 0. It looks like the intent was to have a 5 sec default. So now both defaults are applied when options are sent BUT freq or timeout aren't included in those options.

What issues does this PR fix or reference?

forcedotcom/cli#2319
@W-13797305@