fix(uptime): Correct seat error validation format

[evanpurkhiser]

These need to be arrays to be properly handled by the frontend. All
other errors come back correctly as arrays.

[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
23608	2	23606	291

View the top 2 failed test(s) by shortest run time

tests.snuba.tagstore.test_tagstore_backend.TagStorageTest::test_get_group_tag_key_generic

Stack Traces | 7.32s run time

#x1B[1m#x1B[.../snuba/tagstore/test_tagstore_backend.py#x1B[0m:554: in test_get_group_tag_key_generic
    assert (
#x1B[1m#x1B[.../tagstore/snuba/backend.py#x1B[0m:479: in get_group_tag_key
    return self.__get_tag_key_and_top_values(
#x1B[1m#x1B[.../tagstore/snuba/backend.py#x1B[0m:207: in __get_tag_key_and_top_values
    raise TagKeyNotFound if group is None else GroupTagKeyNotFound
#x1B[1m#x1B[31mE   sentry.tagstore.exceptions.GroupTagKeyNotFound#x1B[0m

tests.snuba.tagstore.test_tagstore_backend.TagStorageTest::test_get_group_tag_keys_and_top_values_generic_issue

Stack Traces | 7.52s run time

#x1B[1m#x1B[.../snuba/tagstore/test_tagstore_backend.py#x1B[0m:295: in test_get_group_tag_keys_and_top_values_generic_issue
    assert set(tags) == {"foo", "biz", "environment", "sentry:user", "level", "sentry:release"}
#x1B[1m#x1B[31mE   AssertionError: assert set() == {'biz', 'envi...'sentry:user'}#x1B[0m
#x1B[1m#x1B[31mE     #x1B[0m
#x1B[1m#x1B[31mE     Extra items in the right set:#x1B[0m
#x1B[1m#x1B[31mE     'foo'#x1B[0m
#x1B[1m#x1B[31mE     'sentry:user'#x1B[0m
#x1B[1m#x1B[31mE     'environment'#x1B[0m
#x1B[1m#x1B[31mE     'sentry:release'#x1B[0m
#x1B[1m#x1B[31mE     'level'#x1B[0m
#x1B[1m#x1B[31mE     'biz'#x1B[0m
#x1B[1m#x1B[31mE     #x1B[0m
#x1B[1m#x1B[31mE     Full diff:#x1B[0m
#x1B[1m#x1B[31mE     + set()#x1B[0m
#x1B[1m#x1B[31mE     - {#x1B[0m
#x1B[1m#x1B[31mE     -     'biz',#x1B[0m
#x1B[1m#x1B[31mE     -     'environment',#x1B[0m
#x1B[1m#x1B[31mE     -     'foo',#x1B[0m
#x1B[1m#x1B[31mE     -     'level',#x1B[0m
#x1B[1m#x1B[31mE     -     'sentry:release',#x1B[0m
#x1B[1m#x1B[31mE     -     'sentry:user',#x1B[0m
#x1B[1m#x1B[31mE     - }#x1B[0m

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