[chore] tweak NoLLaMas proof-of-work algorithm (#4090)

# Description

- tweaks the NoLLaMas proof-of-work algorithm to further granularity on time spent computing solutions
- standardizes GoToSocial cookie security directive setting in a CookiePolicy{} type

## Checklist

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [x] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [x] I/we have commented the added code, particularly in hard-to-understand areas.
- [ ] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [ ] I/we have run tests and they pass locally with the changes.
- [x] I/we have run `go fmt ./...` and `golangci-lint run`.

Co-authored-by: tobi <tobi.smethurst@protonmail.com>
Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4090
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

testrig/config.go

@@ -170,6 +170,7 @@ func testDefaults() config.Configuration {
 		AdvancedRateLimitRequests:    0, // disabled
 		AdvancedThrottlingMultiplier: 0, // disabled
 		AdvancedSenderMultiplier:     0, // 1 sender only, regardless of CPU
+		AdvancedScraperDeterrence:    envBool("GTS_ADVANCED_SCRAPER_DETERRENCE", false),
 
 		SoftwareVersion: "0.0.0-testrig",
 
@@ -178,6 +179,13 @@ func testDefaults() config.Configuration {
 	}
 }
 
+func envBool(key string, _default bool) bool {
+	return env(key, _default, func(value string) bool {
+		b, _ := strconv.ParseBool(value)
+		return b
+	})
+}
+
 func envInt(key string, _default int) int {
 	return env(key, _default, func(value string) int {
 		i, _ := strconv.Atoi(value)