curl: --test-duphandle in debug builds runs "duphandled"

Using this option (only available in debug builds) makes curl always
call curl_easy_duphandle() on the handle before using it.

curl: --test-duphandle in debug builds runs "duphandled"

Using this option (only available in debug builds) makes curl always
call curl_easy_duphandle() on the handle before using it.

To help us catch curl_easy_duphandle() mistakes better.

Add a CI job using this.

Bonus: the previous runtests option -e is now also supported as
--test-event

Closes #15504

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tests: 780 - 783, new HSTS tests

test780: verify updated HSTS data in response header

test781: HSTS update expiry, with parent includeSubDomains domain
present

test782:

tests: 780 - 783, new HSTS tests

test780: verify updated HSTS data in response header

test781: HSTS update expiry, with parent includeSubDomains domain
present

test782: HSTS update expiry, with two includeSubDomains domains present

test783: HSTS update expiry, removing includesubdomains in update

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