refactor(ekf_localizer): fix tf2 listener

[YamatoAndo]

Description

In the ekf_localizer node, there is a strange way of writing for tf_listener , so I fixed it.

Related links

Parent Issue:

• Link

How was this PR tested?

Lsim works

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[SakodaShintaro]

Basically, I think it's fine, but I understand that the behavior has changed.
get_transform_from_tf used to wait for tf for up to 5 seconds, it doesn't wait after the change.
I just want to remember that this PR may be a problem in very specific cases.

[YamatoAndo]

@SakodaShintaro If you're concerned about it, should we implement it using canTransform?

[SakodaShintaro]

I see https://docs.ros.org/en/indigo/api/tf2_ros/html/c++/classtf2__ros_1_1Buffer.html#a2971d78ba006fd6c3dd67c53870317fd

timeout	How long to block before failing

This argument seems to be able to reproduce the previous behavior almost completely.

I don't think there's any need to fix to use this.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 24.00%. Comparing base (b247c43) to head (723dbc1).
Report is 37 commits behind head on main.

Files	Patch %	Lines
localization/ekf_localizer/src/ekf_localizer.cpp	66.66%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8584   +/-   ##
=======================================
  Coverage   23.99%   24.00%           
=======================================
  Files        1384     1384           
  Lines      102173   102178    +5     
  Branches    38956    38958    +2     
=======================================
+ Hits        24520    24525    +5     
  Misses      75180    75180           
  Partials     2473     2473           

Flag	Coverage Δ		*Carryforward flag
differential	31.43% <66.66%> (?)
total	23.99% <ø> (-0.01%)	⬇️	Carriedforward from b247c43

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