[Chore] Avoid Manually Setting Request Content Length

[ajimae]

Summary

Avoid setting content-length manually

Completed Tasks

• remove manually calculated content-length in the SDK and allow underlying client to carryout the computation

Related Issue

#1262

[changeset-bot]

🦋 Changeset detected

Latest commit: c4d1cde

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@commercetools/ts-client	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.62%. Comparing base (6d813e2) to head (c4d1cde).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1266      +/-   ##
==========================================
- Coverage   97.62%   97.62%   -0.01%     
==========================================
  Files          88       88              
  Lines        1347     1345       -2     
  Branches      351      346       -5     
==========================================
- Hits         1315     1313       -2     
- Misses         26       28       +2     
+ Partials        6        4       -2     

Flag	Coverage Δ
test-coverage	97.62% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.