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: add `cookies` features

These tests don't work with `--disable-cookies`.

Closes https://github.com/curl/curl/pull/10713

test{440,441,493,977}: add "HTTP proxy" keywords

... so the tests can be automatically skipped when
using an external proxy like Privoxy.

Closes #8959

test977: reproduce ability to set cookie on TLD

When PSL is not enabled