Show message on reports closed to updates.

[dracos]

To do:

• (post-deploy) [UK] Add running of process-inactive-reports to crontab.

Fixes https://github.com/mysociety/fixmystreet-commercial/issues/875

[codecov]

Codecov Report

Merging #2163 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2163   +/-   ##
=======================================
  Coverage   78.84%   78.84%           
=======================================
  Files         182      182           
  Lines       11754    11754           
  Branches     2190     2189    -1     
=======================================
  Hits         9268     9268           
  Misses       1721     1721           
  Partials      765      765

Impacted Files	Coverage Δ
perllib/Open311/GetServiceRequestUpdates.pm	73.56% <0%> (ø)	⬆️

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[struan]

Looks good. A test might be nice :)

[zarino]

I think this is fine for what it is, design-wise. Something about the "make…" immediately after the statement feels abrupt to me. I felt like I expected it to be worded "…closed to updates – but you can make a new…"