LOCAL: Pull requests list Speed up non recursive list_dir for google cloud storage

[pjbull]

Local branch for running live tests on #318.

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The non-recursive implementation of list_dir for google cloud was slow.
The issue was already stated in the code that we just filtered out the top-level files and dirs out of al the blobs.

This is fixed by setting the delimiter='/' when listing a directory non-recursive.

Perf results

Before

┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━┳━━━━━━━━━┓
┃ Test Name      ┃ Config Name                ┃ Iterations ┃           Mean ┃              Std ┃            Max ┃ N Items ┃
┡━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━╇━━━━━━━━━┩
│ List Folders   │ List shallow recursive     │         10 │ 0:00:01.754618 │ ± 0:00:00.043073 │ 0:00:01.854687 │   5,500 │
│ List Folders   │ List shallow non-recursive │         10 │ 0:00:01.839951 │ ± 0:00:00.146716 │ 0:00:02.194600 │   5,500 │
│ List Folders   │ List normal recursive      │         10 │ 0:00:02.670551 │ ± 0:00:00.142644 │ 0:00:02.984851 │   7,877 │
│ List Folders   │ List normal non-recursive  │         10 │ 0:00:02.568673 │ ± 0:00:00.037830 │ 0:00:02.609728 │     113 │
│ List Folders   │ List deep recursive        │         10 │ 0:00:06.076180 │ ± 0:00:00.893733 │ 0:00:07.018396 │   7,955 │
│ List Folders   │ List deep non-recursive    │         10 │ 0:00:05.576774 │ ± 0:00:00.790192 │ 0:00:07.463698 │      31 │
│ Glob scenarios │ Glob shallow recursive     │         10 │ 0:00:01.943264 │ ± 0:00:00.073614 │ 0:00:02.100214 │   5,500 │
│ Glob scenarios │ Glob shallow non-recursive │         10 │ 0:00:02.041357 │ ± 0:00:00.409244 │ 0:00:03.196892 │   5,500 │
│ Glob scenarios │ Glob normal recursive      │         10 │ 0:00:02.708558 │ ± 0:00:00.059786 │ 0:00:02.772853 │   7,272 │
│ Glob scenarios │ Glob normal non-recursive  │         10 │ 0:00:02.355530 │ ± 0:00:00.033168 │ 0:00:02.397684 │      12 │
│ Glob scenarios │ Glob deep recursive        │         10 │ 0:00:08.697164 │ ± 0:00:02.117151 │ 0:00:13.550607 │   7,650 │
│ Glob scenarios │ Glob deep non-recursive    │         10 │ 0:00:10.489393 │ ± 0:00:02.967771 │ 0:00:15.646034 │      25 │
└────────────────┴────────────────────────────┴────────────┴────────────────┴──────────────────┴────────────────┴─────────┘

After

┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━┳━━━━━━━━━┓
┃ Test Name      ┃ Config Name                ┃ Iterations ┃           Mean ┃              Std ┃            Max ┃ N Items ┃
┡━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━╇━━━━━━━━━┩
│ List Folders   │ List shallow recursive     │         10 │ 0:00:01.782473 │ ± 0:00:00.079213 │ 0:00:01.978639 │   5,500 │
│ List Folders   │ List shallow non-recursive │         10 │ 0:00:01.658828 │ ± 0:00:00.055595 │ 0:00:01.796994 │   5,500 │
│ List Folders   │ List normal recursive      │         10 │ 0:00:02.438342 │ ± 0:00:00.086166 │ 0:00:02.603272 │   7,877 │
│ List Folders   │ List normal non-recursive  │         10 │ 0:00:00.172392 │ ± 0:00:00.008785 │ 0:00:00.191022 │     113 │
│ List Folders   │ List deep recursive        │         10 │ 0:00:08.002241 │ ± 0:00:01.882228 │ 0:00:10.528643 │   7,955 │
│ List Folders   │ List deep non-recursive    │         10 │ 0:00:00.168641 │ ± 0:00:00.007435 │ 0:00:00.179845 │      31 │
│ Glob scenarios │ Glob shallow recursive     │         10 │ 0:00:01.811696 │ ± 0:00:00.034521 │ 0:00:01.851655 │   5,500 │
│ Glob scenarios │ Glob shallow non-recursive │         10 │ 0:00:01.825440 │ ± 0:00:00.080909 │ 0:00:01.984854 │   5,500 │
│ Glob scenarios │ Glob normal recursive      │         10 │ 0:00:02.665863 │ ± 0:00:00.068024 │ 0:00:02.777973 │   7,272 │
│ Glob scenarios │ Glob normal non-recursive  │         10 │ 0:00:00.172190 │ ± 0:00:00.006265 │ 0:00:00.189009 │      12 │
│ Glob scenarios │ Glob deep recursive        │         10 │ 0:00:07.589083 │ ± 0:00:01.563928 │ 0:00:11.491544 │   7,650 │
│ Glob scenarios │ Glob deep non-recursive    │         10 │ 0:00:00.169732 │ ± 0:00:00.006388 │ 0:00:00.179240 │      25 │
└────────────────┴────────────────────────────┴────────────┴────────────────┴──────────────────┴────────────────┴─────────┘

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