Move WLM description to per-rule field (#525)

[dzane17]

Bug fix

The previous WLM group Description field was semantically incorrect and nonfunctional. Workload group objects have no description attribute, so values typed into that field were never saved on the group. The dashboard worked around this by writing the string into the WLM rule description field. This PR makes Description properly display and save as a per-rule attribute instead of per-group.

Other cosmetic changes

• Per-rule fields (Description, Username, Role, Index wildcard) collapsed from 4 stacked rows to a 2x2 grid (Description top-left, Index wildcard top-right, Username bottom-left, Role bottom-right). Auto-stacks to 4x1 on narrow viewports.
• Replaced multi-line text input with single-line input all four rule fields. This reduces the vertical page size drastically.

Screenshots

Old Create Group Page

New Create Group Page

Old Group Details Page

New Group Details Page

Issues Resolved

Resolves #525

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[kkhatua]

@ansjcy , @KishoreKicha14 can u take a look at this?
@dzane17 can we make the text box multiline with initial size of single line, but resizeable?

[dzane17]

@kkhatua Originally I thought 1 line should be sufficient because input is all CSV. However for long strings, auto expand will be more friendly than horizontal scroll. I have made this change.

[KishoreKicha14]

LGTM!

[dzane17]

Mend check will be fixed in #527 after OSD bumps their version