fix: add publicUrl to exclude promisifyAll

[fernandolguevara]

Fixes #1344

I exclude "publicUrl" from the list of functions that will use promises

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[AVaksman]

@fernandolguevara Thank you for contribution.

Just a couple of nits.

[AVaksman]

Please place 'publicUrl' in alphabetic order.

Also please add 'publicUrl' to the list to fix unit tests

nodejs-storage/test/file.ts

Line 77 in 642a9df

assert.deepStrictEqual(options.exclude, ['request', 'setEncryptionKey']);

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[codecov]

Codecov Report

Merging #1339 (676a268) into master (91a65f8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1339   +/-   ##
=======================================
  Coverage   99.00%   99.00%           
=======================================
  Files          14       14           
  Lines       11804    11804           
  Branches      526      595   +69     
=======================================
  Hits        11687    11687           
  Misses        117      117           

Impacted Files	Coverage Δ
src/file.ts	99.94% <100.00%> (ø)

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[shaffeeullah]

@fernandolguevara friendly bump. If you do not have time to implement the requested changes, let me know and I can take it over from here. However, please sign the CLA so this PR can be merged. Thanks for making these changes!

[fernandolguevara]

@googlebot I signed it!

This was addressed