Use Object name prefix strategy for PCU part files (#1110)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.93%. Comparing base (bdf7b57) to head (8963baf).

Files	Patch %	Lines
...oud/hadoop/gcsio/GoogleCloudStorageClientImpl.java	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1219 +/- ## ============================================ + Coverage 81.91% 81.93% +0.02% - Complexity 1952 1953 +1 ============================================ Files 106 106 Lines 8787 8787 Branches 1066 1066 ============================================ + Hits 7198 7200 +2 + Misses 1143 1142 -1 + Partials 446 445 -1 ``` | [Flag](https://app.codecov.io/gh/GoogleCloudDataproc/hadoop-connectors/pull/1219/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=GoogleCloudDataproc) | Coverage Δ | | |---|---|---| | [integrationtest](https://app.codecov.io/gh/GoogleCloudDataproc/hadoop-connectors/pull/1219/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=GoogleCloudDataproc) | `67.31% <0.00%> (-0.10%)` | :arrow_down: | | [unittest](https://app.codecov.io/gh/GoogleCloudDataproc/hadoop-connectors/pull/1219/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=GoogleCloudDataproc) | `73.42% <0.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=GoogleCloudDataproc#carryforward-flags-in-the-pull-request-comment) to find out more.

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