Fix #10448 Map plugin should not initizialize invalid maps

[allyoucanmap]

Description

This PR includes following fixes:

• add a validation check for map configuration in Map plugin
• remove canRender internal state from the Map plugins because it's not used anymore, it was introduced for font loading

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)

• Minor changes to existing features

Issue

What is the current behavior?

#10448

What is the new behavior?

Map plugin components mount only when a valid configuration is provided

Breaking change

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

• No

Other useful information