Switch back to third party fetch lib for all node versions

[rejas]

As discussed in #2952

[codecov-commenter]

Codecov Report

Merging #2961 (99bbe0c) into develop (7058fc5) will increase coverage by 0.34%.
The diff coverage is 74.43%.

@@             Coverage Diff             @@
##           develop    #2961      +/-   ##
===========================================
+ Coverage    22.93%   23.28%   +0.34%     
===========================================
  Files           48       48              
  Lines        10008    10034      +26     
===========================================
+ Hits          2295     2336      +41     
+ Misses        7713     7698      -15     

Impacted Files	Coverage Δ
js/server.js	78.61% <68.80%> (+2.39%)	⬆️
js/app.js	84.03% <100.00%> (+0.76%)	⬆️
js/fetch.js	100.00% <100.00%> (+10.00%)	⬆️
modules/default/updatenotification/node_helper.js	74.28% <0.00%> (+15.71%)	⬆️

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[khassel]

3 things:

• there are jsdoc warnings :)
• should this line not reverted back now to require("fetch")?
• can you mention replace node-fetch with native fetch module (coming with node v18) #2649 in the description because its related

Thanks.

[rejas]

Done