Updates to sample import

[irzamsarfraz]

• Add ui and backend logic to import samples from multiple pipelines using file selectors instead of directories
• Fixed issue Issue in loading cellranger files in shiny docker app  #688

[codecov]

Codecov Report

Patch coverage: 5.94% and project coverage change: -0.39 ⚠️

Comparison is base (65dd1a3) 53.18% compared to head (d321f67) 52.80%.

❗ Current head d321f67 differs from pull request most recent head 72bef02. Consider uploading reports for the commit 72bef02 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #709      +/-   ##
==========================================
- Coverage   53.18%   52.80%   -0.39%     
==========================================
  Files          79       79              
  Lines       12579    12679     +100     
==========================================
+ Hits         6690     6695       +5     
- Misses       5889     5984      +95     

Impacted Files	Coverage Δ
R/importMultipleSources.R	34.11% <5.94%> (-25.54%)	⬇️

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