fix(instrumentation-redis-4): fix unhandledRejection in client.multi(...) handling

[trentm]

The instrumentation was not handling a rejection of the promise from client.multi(), resulting in unended spans and an unhandleRejection event.

Fixes: #1708

---

This is based on work by @FredrikAugust in #1717.

[codecov]

Codecov Report

Merging #1730 (3a7c993) into main (a8c225d) will decrease coverage by 0.01%.
Report is 1 commits behind head on main.
The diff coverage is 85.71%.

❗ Current head 3a7c993 differs from pull request most recent head 5000091. Consider uploading reports for the commit 5000091 to get more accurate results

@@            Coverage Diff             @@
##             main    #1730      +/-   ##
==========================================
- Coverage   91.72%   91.71%   -0.01%     
==========================================
  Files         139      139              
  Lines        7128     7137       +9     
  Branches     1433     1434       +1     
==========================================
+ Hits         6538     6546       +8     
- Misses        590      591       +1     

Files	Coverage Δ
...try-instrumentation-redis-4/src/instrumentation.ts	81.00% <85.71%> (+0.37%)	⬆️

[pichlermarc]

Looks good, thank you for taking care of this so quickly - and thanks for the detailed explaination on the original issue. 🙂