Show Cylc object ID, type and status at top of mutations menu

[MetRonnie]

These changes close #769

Show the task/job/cycle/workflow ID, type and state at the top of the mutations menu (or just that alone if the object doesn't have a mutations menu)

Not sure how to write a test for this

Screenshots

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Requirements check-list

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Appropriate tests are included (unit and/or functional).
• Appropriate change log entry included.
• No documentation update required.

Also to do:

• Update wiki entry for v-cylc-object directive

[codecov-commenter]

Codecov Report

Merging #891 (0c99038) into master (5858614) will decrease coverage by 0.18%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #891      +/-   ##
==========================================
- Coverage   90.48%   90.30%   -0.19%     
==========================================
  Files          92       92              
  Lines        1986     2000      +14     
  Branches      146      151       +5     
==========================================
+ Hits         1797     1806       +9     
- Misses        162      168       +6     
+ Partials       27       26       -1     

Flag	Coverage Δ
e2e	76.45% <71.42%> (-0.09%)	⬇️
unittests	78.25% <100.00%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/components/cylc/table/Table.vue	77.27% <ø> (ø)
src/components/cylc/tree/TreeItem.vue	100.00% <ø> (ø)
src/components/cylc/workflow/Toolbar.vue	73.07% <ø> (ø)
src/components/cylc/cylcObject/Menu.vue	75.86% <57.14%> (-5.96%)	⬇️
src/components/cylc/cylcObject/plugin.js	100.00% <100.00%> (ø)
.../components/graphqlFormGenerator/FormGenerator.vue	86.95% <100.00%> (+4.34%)	⬆️
src/utils/aotf.js	93.40% <100.00%> (ø)

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[wxtim]

• Read, seems sane.
• Tried, works for me.

Not entirely nice if users make task names very long - discussed in person.

[MetRonnie]

Not entirely nice if users make task names very long

• Reduced font size of object ID title
• Set max width of 600px for mutations menu

[MetRonnie]

Mobile view (iPhone SE size)

[wxtim]

Happy with your response to my review comment. :)

[hjoliver]

LGTM