fix: rm unused options in IterativeVertexFinder.cc

[wdconinc]

Briefly, what does this PR introduce?

This PR removes an entirely unused options variable (and type alias) in IterativeVertexFinder.

What kind of change does this PR introduce?

• Bug fix (issue: unused code)
• New feature (issue #__)
• Documentation update
• Other: __

Please check if this PR fulfills the following:

• Tests for the changes have been added
• Documentation has been added / updated
• Changes have been communicated to collaborators

Does this PR introduce breaking changes? What changes might users need to make to their code?

No.

Does this PR change default behavior?

No.

[github-actions]

Capybara summary for PR 1712

• rec_dis_10x100_minQ2=0_craterlake
• rec_dis_10x100_minQ2=1000_craterlake_tracking_only
• rec_dis_18x275_minQ2=0_craterlake_18x275
• rec_dis_18x275_minQ2=1000_craterlake_18x275
• rec_dis_5x41_minQ2=0_craterlake_5x41
• rec_e_1GeV_20GeV_craterlake
• rec_pi_1GeV_20GeV_craterlake
  ^{_{Last updated 2025-01-17T11:21-05:00 7a2dc33}}

[ruse-traveler]

LGTM! Changes are quite reasonable, so this looks good-to-go once the IWYU patch gets applied.

[veprbl]

/home/runner/work/EICrecon/EICrecon/src/algorithms/tracking/IterativeVertexFinder.cc:14:10: fatal error: 'Acts/Vertexing/IVertexFinder.hpp' file not found
#include <Acts/Vertexing/IVertexFinder.hpp>
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

on 24.04.0-stable

[wdconinc]

/home/runner/work/EICrecon/EICrecon/src/algorithms/tracking/IterativeVertexFinder.cc:14:10: fatal error: 'Acts/Vertexing/IVertexFinder.hpp' file not found
#include <Acts/Vertexing/IVertexFinder.hpp>
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

on 24.04.0-stable

I guess I should have continue to ignore the iywu suggestions for headers with acts preprocessors...

[veprbl]

Lack of preprocessors

[wdconinc]

I guess I should have continue to ignore the iywu suggestions for headers with acts preprocessors...

Reverted. Propose to keep as is.

[veprbl]

If this compiles, this should be good.