Storage performance fixes

[Porges]

Noticed a few things while doing #3304, so fixing them in another PR:

• Add CreateNewContainer which will always create a new container instead of looking for one first.
• InstanceId was not being cached properly (the Lazy would be recreated upon every request) — my fault!
• Add GetBlob beside GetBlogWithTags for when we don't need the tags
• Make GetBlogWithTags do both fetches in parallel

[codecov-commenter]

Codecov Report

Merging #3313 (8361359) into main (e68fc45) will increase coverage by 0.03%. The diff coverage is 86.53%.

@@            Coverage Diff             @@
##             main    #3313      +/-   ##
==========================================
+ Coverage   31.80%   31.83%   +0.03%     
==========================================
  Files         307      307              
  Lines       37334    37357      +23     
==========================================
+ Hits        11874    11894      +20     
- Misses      25460    25463       +3     

Files Changed	Coverage Δ
src/ApiService/ApiService/Functions/Jobs.cs	73.46% <83.33%> (+1.02%)	:arrow_up:
src/ApiService/ApiService/onefuzzlib/Containers.cs	69.85% <86.84%> (+1.17%)	:arrow_up:
src/ApiService/ApiService/Functions/Containers.cs	87.67% <100.00%> (ø)
src/ApiService/ApiService/onefuzzlib/Events.cs	70.68% <100.00%> (ø)