LP1999158 Form labels for eg-org-select component

LP1999158 Form labels for eg-org-select component

Adds several input directives to <eg-org-select> to support <label> tags
with various options. Label tags are included alongside inputs unless
explicitly suppressed. Where a visible label would disrupt the current
layout, the "sr-only" CSS class may be used to hide the label visually
while leaving it available to screen readers.

All current instances of <eg-org-select> have been updated. Where labels
already existed, those with specific layout requirements have been
adjusted only to add missing "for" attributes, and the component's
automatic output is suppressed.

Signed-off-by: Stephanie Leary <stephanie.leary@equinoxOLI.org>