feat(ui): allow resending of webhooks to update deployed version

[JosephKav]

requested in #102

resend availability for upgrades to newer LatestVersion. Have added minimum delays to these sends of 15s if they fail and 2xInterval of the Service if they pass. Users could change their browser times to get around the disabled buttons, but the server keeps track of the next runnable time and ignores the request if it's too early. We could still get situations where two users approve commands/webhooks before they find out that another user did the same. In this case, if the delay between these requests is big enough that the goroutines have synced the next runnable time, then only one request will be made, but if the goroutines haven't been synched yet, the webhooks/commands could be actioned twice. If people want, I could look into mutex locks to account for this possibility, but I feel that this isn't really a risk and so not worth further investigation.

normal modal:

command fails (same for webhooks):

button gets disabled and hourglass appears with re-send available time tooltip. Relatively useless for command/webhooks that fail atm as the retry interval is 15s and the tooltip just says the minute it'll be resendable.

after 15s:

successful command/webhook:

resendable after 2xInterval

[codecov]

Codecov Report

Merging #110 (2c0e389) into master (ec7a6d2) will increase coverage by 0.10%.
The diff coverage is 100.00%.

❗ Current head 2c0e389 differs from pull request most recent head ceaeece. Consider uploading reports for the commit ceaeece to get more accurate results

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
+ Coverage   95.59%   95.69%   +0.10%     
==========================================
  Files          49       49              
  Lines        4419     4517      +98     
==========================================
+ Hits         4224     4322      +98     
  Misses        148      148              
  Partials       47       47              

Impacted Files	Coverage Δ
web/api/types/argus.go	100.00% <ø> (ø)
commands/announce.go	100.00% <100.00%> (ø)
commands/commands.go	100.00% <100.00%> (ø)
commands/init.go	100.00% <100.00%> (ø)
config/init.go	100.00% <100.00%> (ø)
service/handlers.go	100.00% <100.00%> (ø)
service/init.go	100.00% <100.00%> (ø)
web/api/v1/websocket-hub.go	93.34% <100.00%> (+0.16%)	⬆️
web/api/v1/websocket.go	93.46% <100.00%> (+0.03%)	⬆️
webhook/announce.go	100.00% <100.00%> (ø)
... and 4 more

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