pay higher gas price, wait longer to issue kudos

[danlipert]

Description

This PR raises the amount we are willing to pay for gas, allows a 5 hour window for kudos sending transactions to be confirmed to attempt to get a better gas price, waits longer between rechecking gas prices for a kudos send, and rate limits the kudos sending task.

Refers/Fixes

n/a

Testing

untested - needs to be deployed and then monitored via flower

[codecov]

Codecov Report

Merging #7265 into master will increase coverage by 2.13%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #7265      +/-   ##
==========================================
+ Coverage   26.08%   28.22%   +2.13%     
==========================================
  Files         297      298       +1     
  Lines       29539    32232    +2693     
  Branches     4386     5160     +774     
==========================================
+ Hits         7706     9097    +1391     
- Misses      21562    22778    +1216     
- Partials      271      357      +86     

Impacted Files	Coverage Δ
app/kudos/tasks.py	28.94% <50.00%> (ø)
app/app/urls.py	79.10% <0.00%> (-6.87%)	⬇️
...arketing/management/commands/new_bounties_email.py	40.50% <0.00%> (-4.57%)	⬇️
app/quests/views.py	16.22% <0.00%> (ø)
app/dashboard/views.py	10.33% <0.00%> (ø)
app/economy/management/commands/get_prices.py	0.00% <0.00%> (ø)
app/grants/management/commands/estimate_clr.py	0.00% <0.00%> (ø)
app/marketing/management/commands/post_data.py	0.00% <0.00%> (ø)
...rants/management/commands/grant_vitalik_shuffle.py	0.00% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)
... and 12 more

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