add missing 'FORMAT' parameter to WMTS GetFeatureInfo requests

[landryb]

this is required by the WMTS spec to be the same format as would be used for a GetTile request, and this allows GFI requests to succeed on https://data.geopf.fr/wmts.

Description

See #10595

Please check if the PR fulfills these requirements

• [ ] The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• [x] Bugfix

Issue

What is the current behavior?

10595

What is the new behavior?

GetFeatureInfo requests on https://data.geopf.fr/wmts works.

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• [ ] Yes, and I documented them in migration notes
• [x] No

Other useful information

[tdipisa]

Thank you so much for your contribution @landryb

[allyoucanmap]

@landryb thanks for the contribution. @ElenaGallo please test this fix on dev and let us know if we can backport on 2024.02.xx, thanks

[ElenaGallo]

Test passed, @allyoucanmap please backport to 2024.02.xx. Thanks

[allyoucanmap]

@ElenaGallo @tdipisa backport ready for review https://github.com/geosolutions-it/MapStore2/pull/10606