change default nodejs kind from nodejs:10 to nodejs:14

[dgrove-oss]

Node.js 10 hits its end of life on April 30, 2021. (https://nodejs.org/en/about/releases/)

Prepare for deprecation and eventual removal of the nodejs:10 kind by rolling the default for nodejs forward to nodejs:14 (most recent LTS release).

I propose to skip over nodejs:12 (similar to how we jumped from nodejs:6 to nodejs:10) since the change of a default kind (and associated stemcell change) is marginally disruptive.

[dgrove-oss]

Started a dev list discussion as well, since this is a non-trivial change. https://lists.apache.org/thread.html/r95425ad12cabdfbd0552df5768b0b7a260f3311bfe93e925f6d3f57f%40%3Cdev.openwhisk.apache.org%3E

[codecov-commenter]

Codecov Report

Merging #5105 (a1220ff) into master (f7ec9e3) will increase coverage by 36.45%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #5105       +/-   ##
===========================================
+ Coverage   38.79%   75.25%   +36.45%     
===========================================
  Files         218      218               
  Lines       10700    10700               
  Branches      454      454               
===========================================
+ Hits         4151     8052     +3901     
+ Misses       6549     2648     -3901     

Impacted Files	Coverage Δ
...nwhisk/core/scheduler/queue/ContainerCounter.scala	84.21% <0.00%> (-7.90%)	⬇️
.../scala/org/apache/openwhisk/core/entity/Exec.scala	90.62% <0.00%> (+1.56%)	⬆️
.../org/apache/openwhisk/core/entity/EntityPath.scala	100.00% <0.00%> (+1.88%)	⬆️
...la/org/apache/openwhisk/common/TransactionId.scala	94.11% <0.00%> (+2.35%)	⬆️
...e/openwhisk/core/containerpool/ContainerPool.scala	96.81% <0.00%> (+2.78%)	⬆️
.../org/apache/openwhisk/http/PoolingRestClient.scala	91.17% <0.00%> (+2.94%)	⬆️
...sk/core/containerpool/docker/DockerContainer.scala	95.60% <0.00%> (+3.29%)	⬆️
...tainerpool/docker/DockerClientWithFileAccess.scala	96.00% <0.00%> (+4.00%)	⬆️
...a/org/apache/openwhisk/core/entity/TimeLimit.scala	95.65% <0.00%> (+4.34%)	⬆️
...pache/openwhisk/core/containerpool/Container.scala	88.50% <0.00%> (+4.59%)	⬆️
... and 121 more

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