refactor(cell_based_table): rename iter_with_pk to dedup_pk_iter

[kwannoel]

What's changed and what's your intention?

See: #3203 (comment)

Please explain IN DETAIL what the changes are in this PR and why they are needed:

• Summarize your change (mandatory)
• How does this PR work? Need a brief introduction for the changed logic (optional)
• Describe clearly one logical change and avoid lazy messages (optional)
• Describe any limitations of the current code (optional)
• Add the 'user-facing changes' label if your PR contains changes that are visible to users (optional)

Checklist

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

Refer to a related PR or issue link (optional)

related #3203

[skyzh]

Please also use Rust doc string on the function to tell about what this function do. e.g.

/// pk_dedup_iter should be used when pk is not persisted as value in storage. It will attempt to decode pk from key instead of cell value. Tracking issue: .

[codecov]

Codecov Report

Merging #3209 (cad1bff) into main (c86f7e2) will not change coverage.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##             main    #3209   +/-   ##
=======================================
  Coverage   73.57%   73.57%           
=======================================
  Files         745      745           
  Lines      102290   102290           
=======================================
  Hits        75263    75263           
  Misses      27027    27027           

Flag	Coverage Δ
rust	73.57% <66.66%> (ø)

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

Impacted Files	Coverage Δ
src/batch/src/executor/row_seq_scan.rs	23.27% <0.00%> (ø)
src/stream/src/executor/batch_query.rs	91.42% <ø> (ø)
src/storage/src/table/cell_based_table.rs	71.30% <100.00%> (ø)
src/storage/src/table/test_relational_table.rs	98.22% <100.00%> (ø)
src/meta/src/barrier/mod.rs	69.13% <0.00%> (-0.33%)	⬇️
src/common/src/types/ordered_float.rs	24.90% <0.00%> (+0.19%)	⬆️

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