Adds TownXX maps to integration tests.

[francocipollone]

Related to maliput/maliput_infrastructure#224

[francocipollone]

CI is failing during RoadNetworkBuilderTest when checking invariants for Town11 map
https://github.com/ToyotaResearchInstitute/maliput_malidrive/pull/145/checks?check_run_id=3256012617#step:15:11341

Interesting, will check

EDITED:

It isn't because of actual invariants but because of failure in the orientation method similarly to maliput/delphyne_demos#17 (comment)

[OrientationOutFromLane] lane: 682_0_1
[OrientationOutFromLane] lanened: Finish
unknown file: Failure
C++ exception with description "road_curve.cc:Orientation:108: 19.383793 is greater than 19.309339" thrown in the test body.

[francocipollone]

This is easily reproducible with maliput_query app as follow:

1. Get lane length:

maliput_query GetLaneLength 682_0_1 -xodr_file_path=Town11.xodr --linear_tolerance=0.16

Lane length for  682_0_1:    [22.7933]

2. Then query the orientation at the end:

maliput_query GetOrientation 682_0_1  22.7933 0 0 -xodr_file_path=Town11.xodr --linear_tolerance=0.16

terminate called after throwing an instance of 'maliput::common::assertion_error'
  what():  road_curve.cc:Orientation:108: 19.383793 is greater than 19.309339

The s value(22.7933) is traduced to p value(19.383793) and then it trhows at: https://github.com/ToyotaResearchInstitute/maliput_malidrive/blob/main/maliput_malidrive/src/maliput_malidrive/road_curve/road_curve.cc#L108

---

I've created #146 to track this bug

[francocipollone]

This PR will mutate to only add Towns from 1 to 7 and then a follow-up PR will add Town11 after we solve #146

[francocipollone]

@agalbachicar Ready to review

[agalbachicar]

LGTM