fix(publisher-electron-release-server): set knownLength option for asset upload

[monsterkrampe]

closes: #2087

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• The changes are appropriately documented (if applicable).
• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:
Resubmitting #2088 after rebasing.

[codecov]

Codecov Report

Merging #2706 (7be09a2) into master (204ec25) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2706      +/-   ##
==========================================
- Coverage   74.06%   74.03%   -0.04%     
==========================================
  Files          77       77              
  Lines        2356     2357       +1     
  Branches      436      436              
==========================================
  Hits         1745     1745              
- Misses        462      463       +1     
  Partials      149      149              

Impacted Files	Coverage Δ
...lisher/electron-release-server/src/PublisherERS.ts	26.86% <0.00%> (-0.41%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 204ec25...7be09a2. Read the comment docs.

[monsterkrampe]

Hi @MarshallOfSound,
I just rebased this PR again to make the tests pass.
The changes should be the same as in #2088 so I hope that this is now ready to be merged :)

[monsterkrampe]

Thanks!
I'm very glad to finally see this merged :)