Improve performance for gcp uploads

[andrcuns]

Implement batch uploads using gsutil to improve report upload performance and fix unstable upload results

Allure report

allure-report-publisher generated test report!

rspec: ✅ test report for 08b0a24c

+----------------------------------------------------------------+
|                       behaviors summary                        |
+-----------+--------+--------+---------+-------+-------+--------+
|           | passed | failed | skipped | flaky | total | result |
+-----------+--------+--------+---------+-------+-------+--------+
| commands  | 57     | 0      | 0       | 0     | 57    | ✅     |
| uploaders | 51     | 0      | 0       | 0     | 51    | ✅     |
| helpers   | 123    | 0      | 0       | 0     | 123   | ✅     |
| providers | 48     | 0      | 0       | 0     | 48    | ✅     |
| generator | 9      | 0      | 0       | 0     | 9     | ✅     |
| cli       | 3      | 0      | 0       | 0     | 3     | ✅     |
+-----------+--------+--------+---------+-------+-------+--------+
| Total     | 291    | 0      | 0       | 0     | 291   | ✅     |
+-----------+--------+--------+---------+-------+-------+--------+

[codeclimate]

Code Climate has analyzed commit b77fde0 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 96.2% (50% is the threshold).

This pull request will bring the total coverage in the repository to 98.3% (0.0% change).

View more on Code Climate.