refactor(error): show pretty error in planner test

[BugenZhao]

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What's changed and what's your intention?

After #13264, we print the error sources in PSQL. This PR does the similar stuff for the planner tests.

Also replaced the manual "Cause by" with the source chain. https://github.com/risingwavelabs/risingwave/pull/13348/files#diff-70784a30f4693fe9ecb89ad1b84a60d39562589d2ae378aae9767e0187d64ab3

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Documentation

• My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)

Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[codecov]

Codecov Report

Merging #13348 (9f5a034) into main (8004505) will increase coverage by 0.06%.
Report is 1 commits behind head on main.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main   #13348      +/-   ##
==========================================
+ Coverage   67.74%   67.81%   +0.06%     
==========================================
  Files        1525     1525              
  Lines      259554   259521      -33     
==========================================
+ Hits       175842   175983     +141     
+ Misses      83712    83538     -174     

Flag	Coverage Δ
rust	67.81% <66.66%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/common/src/error.rs	54.91% <ø> (ø)
src/frontend/src/binder/expr/mod.rs	69.54% <100.00%> (-1.94%)	⬇️
src/utils/pgwire/src/pg_message.rs	64.50% <0.00%> (ø)
src/frontend/planner_test/src/lib.rs	87.52% <60.00%> (ø)

... and 19 files with indirect coverage changes

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