tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so

tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.

Hence, fixing them all now might curb this practice from now on.

Closes #12028

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tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

tests: use %TESTNUMBER instead of fixed number

This makes the tests easier to copy and relocate to other test numbers
without having to update content.

Closes #6738

test410: fix for windows

- Pass the very long request header via file instead of command line.

Prior to this change the 49k very long request header string was passed
via comman

test410: fix for windows

- Pass the very long request header via file instead of command line.

Prior to this change the 49k very long request header string was passed
via command line and on Windows that is too long so it was truncated and
the test would fail (specifically msys CI).

Closes https://github.com/curl/curl/pull/6516

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test410: verify HTTPS GET with a 49K request header

skip test 410 for mesalink in the CI as it otherwise hangs "forever"