change consumer timeouts to 1.5sec and task timeout to 6hrs

[matt-bernstein]

consumer timeouts - reduce time to first record w/ tradeoff of increased change that a long-running record is dropped

(longest running record -> exponential retry backoff w/ max of 1sec)

task timeout - reduce potential number of zombie jobs w/ tradeoff of increased chance of canceling a long-running job

(longest projected job -> 10k records has worst case 10 mins from load test, so 100k records would be <2hrs)

[robot-ci-heartex]

Commit https://github.com/HumanSignal/infra/commit/5c0e1611332053874794d590e3ba6eebe7168d51 is created.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 43.76%. Comparing base (fcd7eaf) to head (b614c57).

Files	Patch %	Lines
server/utils.py	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #138 +/- ## ======================================= Coverage 43.76% 43.76% ======================================= Files 40 40 Lines 1812 1812 ======================================= Hits 793 793 Misses 1019 1019 ```

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[robot-ci-heartex]

Commit https://github.com/HumanSignal/infra/commit/5c07a02b3e62d7aa7b7d650f1092e58c139eae29 is created.