Fix the env var name to override default http client timeouts

[volodymyrZotov]

This PR fixes the env var name to override default http client timeouts. Users should set OP_CONNECT_CLIENT_REQ_TIMEOUT to override the timeout.

[codecov-commenter]

Codecov Report

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #105   +/-   ##
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  Coverage        ?   76.96%           
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  Files           ?       27           
  Lines           ?     1980           
  Branches        ?        0           
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  Hits            ?     1524           
  Misses          ?      456           
  Partials        ?        0           

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