Do not duplicate top-level command errors onto stdout; exit 1 not 255

[Mukuwul]

Description

cmd.Execute() printed the top-level command error a second time to stdout and exited with -1 (which surfaces as 255):

if err := RootCmd.Execute(); err != nil {
    fmt.Println(err)   // duplicate, on stdout
    os.Exit(-1)        // 255
}

RootCmd sets neither SilenceErrors nor SilenceUsage, so cobra already prints the error and usage hint to stderr. The extra fmt.Println(err) leaked a duplicate copy onto stdout, so dapr <typo> | some-parser fed the error text into the pipe.

This PR drops the duplicate print (cobra keeps handling stderr) and exits 1.

Verified by splitting the streams:

# before
$ dapr boguscmd 1>/tmp/out 2>/tmp/err ; echo $?
255
$ cat /tmp/out
unknown command "boguscmd" for "dapr"       # leaked onto stdout

# after
$ dapr boguscmd 1>/tmp/out 2>/tmp/err ; echo $?
1
$ cat /tmp/out
                                            # empty
$ cat /tmp/err
Error: unknown command "boguscmd" for "dapr"
Run 'dapr --help' for usage.

Issue reference

Fixes #1677

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests (n/a - top-level error plumbing, no unit-test seam)
• Extended the documentation (n/a - behavior fix)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 16.93%. Comparing base (6838be1) to head (2d66165).
⚠️ Report is 74 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1678      +/-   ##
==========================================
+ Coverage   15.57%   16.93%   +1.36%     
==========================================
  Files          64       65       +1     
  Lines        7244     7323      +79     
==========================================
+ Hits         1128     1240     +112     
+ Misses       6028     5995      -33     
  Partials       88       88              

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