Update Espressif SSH examples to use new "no setup" CMakeFiles.txt

[gojimmypi]

See wolfSSL/wolfssl#6018

[gojimmypi]

New Espressif SSH examples have been added in the ide/Espressif/ESP-IDF/examples directory with #644.

Here's an example CMakeLists.txt that does not need to have wolfSSL copied to the local components directory.

Note there's a cmake FIND_WOLFSSH_DIRECTORY function that traverses up the directory tree looking for wolfSSH.

There's also an option to hard-code a custom location with a WOLFSSH_ROOT cmake variable.

See also the Espressif wolfssh ESP Registry Component, along with various other wolfSSL components.

There are more wolfSSH examples in wolfssh-examples. (WIP to update as of the date of this comment).

See wolfSSL/wolfssl#6234 for a roadmap of Espressif updates.