fix(time_utils): fix unusedFunction

[kobayu858]

Description

This is a fix based on cppcheck unusedFunction warnings.

common/time_utils/src/time_utils/time_utils.cpp:67:0: style: The function 'to_message' is never used. [unusedFunction]
builtin_interfaces::msg::Time to_message(const std::chrono::system_clock::time_point t)
^

common/time_utils/src/time_utils/time_utils.cpp:80:0: style: The function 'from_message' is never used. [unusedFunction]
std::chrono::system_clock::time_point from_message(builtin_interfaces::msg::Time t) noexcept
^

common/time_utils/src/time_utils/time_utils.cpp:67:0: style: The function 'to_message' is never used. [unusedFunction]
builtin_interfaces::msg::Time to_message(std::chrono::nanoseconds dt)
^

common/time_utils/src/time_utils/time_utils.cpp:80:0: style: The function 'from_message' is never used. [unusedFunction]
std::chrono::system_clock::time_point from_message(std::chrono::nanoseconds dt) noexcept
^

common/time_utils/src/time_utils/time_utils.cpp:25:0: style: The function 'duration_to_msg' is never used. [unusedFunction]
TimeT duration_to_msg(std::chrono::nanoseconds dt)
^

Related links

Parent Issue:

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How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 24.07%. Comparing base (b9b0fa9) to head (103aeeb).
Report is 84 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8606   +/-   ##
=======================================
  Coverage   24.06%   24.07%           
=======================================
  Files        1398     1398           
  Lines      102639   102617   -22     
  Branches    39023    39020    -3     
=======================================
  Hits        24704    24704           
+ Misses      75403    75381   -22     
  Partials     2532     2532           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	24.07% <ø> (+<0.01%)	⬆️	Carriedforward from b9b0fa9

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[kobayu858]

@shmpwk @tkimura4

Please confirm the PR. Thank you very much.