[server][wmts][fix] updated constant to correct resolution in WMTS tile grid initialization

[andreassteffens]

Constant needed to be updated in order to match the standard rendering pixel size of 0.28mm x 0.28mm defined by the OGC resulting in DPI of 90.71428571429.

Should fix #34826, fix #42942, fix #39040

[rldhont]

thanks @andreassteffens can you also const tileSize ?

[DelazJ]

Should fix #34826, #42942, #39040

@andreassteffens if you want the three to be closed, the "fix" mention should be added for all, ie Should fix #34826, fix #42942, fix #39040

[rldhont]

@andreassteffens can you run the tests and update the WMTS GetCapabilities that failed.

[andreassteffens]

will take a look at the test case ASAP

[qgis-bot]

The backport to queued_ltr_backports failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-queued_ltr_backports queued_ltr_backports
# Navigate to the new working tree
cd .worktrees/backport-queued_ltr_backports
# Create a new branch
git switch --create backport-43418-to-queued_ltr_backports
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 09d2ca8e4f14583a64bd26b9ab05b930ba318fad,94c2194f43cbeef3cea1d56324e0ddf794354b63,63f47db145c1a2c06ca4fd59f321ea5518783bf3,4b4748c7fae108a29b7e6faa21319eb76a08f378,18bbfa9af4eb1a0e8e948f5e641a8d3e56c1a966,b9ab1b701836890708b95dced60e4ae2360cbb11
# Push it to GitHub
git push --set-upstream origin backport-43418-to-queued_ltr_backports
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-queued_ltr_backports

Then, create a pull request where the base branch is queued_ltr_backports and the compare/head branch is backport-43418-to-queued_ltr_backports.