fix(session_text): Try to find zephyr if build with cmake

* Add a define "WEST_PYTHON" to control it, just same as other sample.

Signed-off-by: 徐宪辉 <xhxu@listenai.com>
7 job 使用!76fix/select_wrong_env in 25 minute 和 12 second (queued for 1 second)
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状态 作业 ID 名称 覆盖率
  Lint
已通过 #74947
generic
code-check

00:01:14

已通过 #74946
generic
code-style

00:00:11

已通过 #74945
generic
dco

00:00:08

已通过 #74948
generic
lisa

00:00:15

 
  Build
已通过 #74951
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docs

00:00:31

已通过 #74950
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guardian

00:03:03

已通过 #74949
generic
zephyr

00:23:57