Fix error on values pass to action-event-register

[khanhtc1202]

What this PR does:

Why we need it:

Values passed to event-register-actions contains some linebreak, which led to execution errors. Let's disable these values this time
ref: https://github.com/pipe-cd/pipecd/actions/runs/14100088870/job/39494761791#step:4:102

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.73%. Comparing base (3290f76) to head (44bafca).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5708      +/-   ##
==========================================
+ Coverage   25.71%   25.73%   +0.01%     
==========================================
  Files         480      480              
  Lines       51095    51095              
==========================================
+ Hits        13141    13147       +6     
+ Misses      36956    36950       -6     
  Partials      998      998              

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