Declare tentative return types for ext/soap

Closes GH-7001

Migrate skip checks to --EXTENSIONS--, p4

For rationale, see #6787

Extensions migrated in part 4:
* simplexml
* skeleton
* soap
* spl
* sqlite3
* sysvmsg

Migrate skip checks to --EXTENSIONS--, p4

For rationale, see #6787

Extensions migrated in part 4:
* simplexml
* skeleton
* soap
* spl
* sqlite3
* sysvmsg
* sysvsem
* tidy - also removed a check for an ancient dependency version

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Fix #69668: SOAP special XML characters in namespace URIs not encoded

`xmlNewNs()` does not XML encode the passed `href`, so we need to do
that manually.

Closes GH-6804.

Fix #69668: SOAP special XML characters in namespace URIs not encoded

`xmlNewNs()` does not XML encode the passed `href`, so we need to do
that manually.

Closes GH-6804.

Signed-off-by: Christoph M. Becker <cmbecker69@gmx.de>

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