fix: enable prefer-nullish-coalescing eslint rule

[JKRhb]

Actually completely resolves #1092.

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (2e6fc09) 75.67% compared to head (f0729ab) 75.93%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1123      +/-   ##
==========================================
+ Coverage   75.67%   75.93%   +0.26%     
==========================================
  Files          80       80              
  Lines       16159    16159              
  Branches     1519     1515       -4     
==========================================
+ Hits        12228    12271      +43     
+ Misses       3889     3846      -43     
  Partials       42       42              

Files	Coverage Δ
packages/binding-mbus/src/mbus-client.ts	82.31% <100.00%> (+15.64%)	⬆️
packages/binding-modbus/src/modbus-client.ts	86.77% <100.00%> (ø)
packages/core/src/codecs/text-codec.ts	63.54% <100.00%> (ø)
packages/td-tools/src/thing-model-helpers.ts	84.41% <100.00%> (ø)
packages/binding-netconf/src/netconf-client.ts	76.66% <0.00%> (+11.11%)	⬆️
...ackages/binding-opcua/src/opcua-protocol-client.ts	79.74% <16.66%> (ø)

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[relu91]

Awesome, good to go.