LIMS-2137: Update vee-validate to v3

[ndg63276]

JIRA tickets: LIMS-2137 and LIMS-2271

Summary:

Update the vee-validate library from v2.x to v3.x.

Changes:

• As there were a few vee-validate references in scipion.html, and that is no longer used (and would be in PaTo anyway), that file has been removed
• As there were lots of vee-validate references in the CONEXS submission pages, and @jacobfilik had already asked to remove them, those have been removed
• Without CONEXS submission, we could use the general menu, rather than needing specific menus for "conexs" and "sp" beamline types, so they have been removed
• Update Vee-Validate to ^3.0.0
• Use newer style of imports for main script and custom rules
• Use the dirty flag instead of changed
• Rewrite custom riles in new style, remove unused field_exists rule, add decimal rule that was native in v2 but doesnt exist in v3
• Remove references to this.$validator and errors.has()
• Rewrite to use <validation-provider rules= instead of v-validate=
• Remove Promise polyfill as it was only needed for IE

To test:

• Test sending feedback by going to /feedback (emails may not work on dev but that is not related to this change)
• Go to a b18, i18 or i20 proposal, check there is no menu item for Conexs submission and /conexs gives a 404
• Test creating an MX shipment, an MX container, and samples within the container. Check the fields all display and there are no errors in the console.
• Test creating an XPDF simple sample:
  • Go to an XPDF proposal eg cm33910, then go to Phases from the main menu
  • Click on one of the phases, then click New Simple Sample at the top
  • Give it a unique acronym, fill in the composition, density and packing fraction, and select Borosilicate 1mm OD for the capillary, and click Add Sample
  • Check there are no errors in the console.
• Go back to the Add Simple Sample page, then select File Upload For Multiple Samples. Check this file uploads ok:
  valid_file.csv