Declare the servlet API compileOnlyApi in grails-web-core and grails-mimetypes

[matrei]

Follow-up to #16356, as discussed in #16356 (comment).

grails-web-core (grails-web-servlets-module) and grails-mimetypes (grails-mimetypes-module) both ship a Groovy extension module whose extension classes take HttpServletRequest, HttpServletResponse, HttpSession and ServletContext in their signatures. The Groovy compiler loads extension modules from any compile classpath they are on, so a module that depends on either of them without the servlet API fails compileGroovy with the same NoClassDefFoundError that #16356 fixed for grails-converters.

Declare the servlet API compileOnlyApi in both, matching grails-converters, grails-controllers, grails-web-gsp and grails-web-taglib.

The runtime classpath is unchanged: in the generated Gradle module metadata jakarta.servlet-api appears on apiElements only, not on runtimeElements.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.1710%. Comparing base (858a92a) to head (4df44b5).
⚠️ Report is 5 commits behind head on 8.0.x.

Additional details and impacted files

@@                Coverage Diff                 @@
##                8.0.x     #16360        +/-   ##
==================================================
+ Coverage     56.1565%   56.1710%   +0.0145%     
- Complexity      21703      21705         +2     
==================================================
  Files            2124       2124                
  Lines          103078     103078                
  Branches        18447      18447                
==================================================
+ Hits            57885      57900        +15     
+ Misses          36922      36905        -17     
- Partials         8271       8273         +2     

see 2 files with indirect coverage changes

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