Circle CI build failure due to timeout

[adithyaov]

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ci/circleci: GHC 8.8 + stack lts-16.12 consistently fails while running test:Data.Array.Foreign with,

Too long with no output (exceeded 10m0s): context deadline exceeded

Removing 2 test cases from the test suite avoid this build failure.

• testArraysOf
• concatArrayW8

This might be Circle CI issue but consistent failure indicates some bugs.

Look at the CI of #945

[adithyaov]

Pushing this to the next milestone.