DisableJob function have a problem with Jobs inside folders

Hello,

If we have a Job inside a folder, EncodingUtils.encode(jobName) will transform backslash "/" character into "%2F" and thus job will not be found.

public void disableJob(String jobName, boolean crumbFlag) throws IOException {
client.post("/job/" + EncodingUtils.encode(jobName) + "/disable", crumbFlag);
}

Start at disableJob(String jobName, boolean crumbFlag) and inspect how EncodingUtils.encode(jobName) handles the slash in folder-qualified Jenkins job names. Trace the client request path and existing tests, if any, and verify that disabling a job inside a folder reaches the intended endpoint without breaking ordinary job names.

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