chore: update fetch-mock and use native fetch

📊 Tachometer Benchmark Results

emoji-picker-element-change-tab: unsure 🔍 -1% - +1% (-0.50ms - +0.34ms)
^{this-change vs tip-of-tree}
emoji-picker-element-database-interactions: unsure 🔍 -5% - +5% (-4.99ms - +5.51ms)
^{this-change vs tip-of-tree}
emoji-picker-element-first-load: unsure 🔍 -4% - +2% (-1.96ms - +1.11ms)
^{this-change vs tip-of-tree}
emoji-picker-element-search: unsure 🔍 -0% - +0% (-0.04ms - +0.22ms)
^{this-change vs tip-of-tree}
emoji-picker-element-second-load: unsure 🔍 -3% - +8% (-1.16ms - +2.70ms)
^{this-change vs tip-of-tree}

emoji-picker-element-change-tab

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	33.48ms - 33.93ms	-	unsure 🔍 -1% - +1% -0.50ms - +0.34ms
tip-of-tree tip-of-tree	33.43ms - 34.14ms	unsure 🔍 -1% - +1% -0.34ms - +0.50ms	-

emoji-picker-element-database-interactions

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	98.87ms - 106.46ms	-	unsure 🔍 -5% - +5% -4.99ms - +5.51ms
tip-of-tree tip-of-tree	98.77ms - 106.04ms	unsure 🔍 -5% - +5% -5.51ms - +4.99ms	-

emoji-picker-element-first-load

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	42.94ms - 45.04ms	-	unsure 🔍 -4% - +2% -1.96ms - +1.11ms
tip-of-tree tip-of-tree	43.29ms - 45.53ms	unsure 🔍 -3% - +4% -1.11ms - +1.96ms	-

emoji-picker-element-search

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	49.98ms - 50.21ms	-	unsure 🔍 -0% - +0% -0.04ms - +0.22ms
tip-of-tree tip-of-tree	49.94ms - 50.06ms	unsure 🔍 -0% - +0% -0.22ms - +0.04ms	-

emoji-picker-element-second-load

Version	Avg time	vs this-change	vs tip-of-tree tip-of-tree
this-change	34.37ms - 37.03ms	-	unsure 🔍 -3% - +8% -1.16ms - +2.70ms
tip-of-tree tip-of-tree	33.52ms - 36.33ms	unsure 🔍 -8% - +3% -2.70ms - +1.16ms	-