fix(pkg/jsonutils): add description to resource list, unskip test

[johnstcn]

While investigating a separate issue (PR incoming), I noticed that the TestResourcesCmdRun_Success had been recently skipped. This led me down a small rabbit hole of fixing up the output of that command.

Here's what I changed:

• pkg/jsonutils:
  • Adds description field to the output of the resources command, which was the original reason for the test being skipped.
  • Modifies formatResourcesList to correctly align with and without coloured output (pet peeve). The main thing to note here is that text/tabwriter's elastic tabstop algorithm still considers colour escape sequences as part of the 'cells', so it's important to take the length of those sequences into account. I ended up also colouring the second line of the output, but can keep it uncoloured if you prefer (EDIT: this might not be as straightforward as I originally thought).
  • Renames the type field of the resources command to the correct mimeType.
• cmd/mcptools/commands:
  • Updates and un-skips the test TestResourcesCmdRun_Success.

The below sample output is from an MCP server I am currently working on.

Before:

NAME               TYPE  URI
----                            ----           ---
Coder User By ID                  coder://user/{id}
Coder Templates                   coder://templates
Coder Workspaces                  coder://workspaces{?limit,offset,owner}
Coder Workspace by ID             coder://workspace/{id}

After:

NAME                   MIMETYPE          URI                                      DESCRIPTION
----                   --------          ---                                      ----------
Coder User By ID       application/json  coder://user/{id}                        Information about a given Coder user. The strin...
Coder Templates        application/json  coder://templates                        List of all Coder templates available to the cu...
Coder Workspaces       application/json  coder://workspaces{?limit,offset,owner}  List of Coder workspaces with optional filterin...
Coder Workspace by ID  application/json  coder://workspace/{id}                   Detailed information about a specific Coder wor..